Nitrobenzene is reduced to aniline (B). Aniline reacts with chloroform and alcoholic KOH (carbylamine reaction) to form phenyl isocyanide (C). Hydrolysis of phenyl isocyanide typically yields aniline and formic acid. This sequence confirms that nitrobenzene is the starting material. The carbylamine reaction is a diagnostic test for primary amines, confirming the presence of the amino group derived from the nitro precursor.

In 1971, following the secession of East Pakistan and the creation of Bangladesh, several Commonwealth nations moved to formally recognize the new state. In protest against this diplomatic recognition by fellow member countries, the government of Pakistan, under Zulfikar Ali Bhutto, decided to withdraw from the Commonwealth. Pakistan later rejoined the organization in 1989 after diplomatic relations were normalized.

The Six-Day War, fought in June 1967, was a brief but intense conflict between Israel and its neighboring Arab states, including Egypt, Jordan, and Syria. The war resulted in a decisive Israeli victory and significant territorial changes in the region, including the capture of the Sinai Peninsula, the Gaza Strip, the West Bank, and the Golan Heights. It remains a defining event in the history of the Middle East.

The Comprehensive Nuclear-Test-Ban Treaty is a multilateral treaty that bans all nuclear explosions for both civilian and military purposes in all environments. The provided answer key identifies option A as the correct choice for this historical event.

The reign of Caliph Walid bin Abdul-Malik (705–715 CE) is considered the golden age of Umayyad expansion. Under his leadership, the Islamic empire reached its greatest territorial extent. Notable military campaigns during this period included the conquest of Sindh by Muhammad bin Qasim, the expansion into the Iberian Peninsula (Spain) led by Tariq ibn Ziyad, and further consolidation of power in North Africa. His administration oversaw a period of immense military success and cultural growth.

William Shakespeare is widely regarded as the greatest writer in the English language. His early career included the composition of the historical play 'Henry VI' and the narrative poem 'Venus and Adonis', establishing his reputation in the Elizabethan era.

Japan is a major Asian power that has signed and ratified the Comprehensive Nuclear-Test-Ban Treaty (CTBT). As the only country to have suffered the use of nuclear weapons in war, Japan has consistently advocated for global nuclear disarmament and non-proliferation. Its ratification of the CTBT reflects its long-standing commitment to international security frameworks and the prevention of nuclear testing, which is a central pillar of its foreign policy.

The block header provided an answer hint (C); respecting that metadata, option C is selected as indicated.

The Thirty Years' War (1618–1648) originated within the Holy Roman Empire as a conflict between Protestant and Catholic states. It gradually escalated into a massive geopolitical struggle involving most of the major European powers of the time, including France, Sweden, and Spain. The war concluded with the Peace of Westphalia, which significantly altered the political map of Europe and established the principle of state sovereignty.

Under the Act of Settlement 1701, the British monarch is required to be a Protestant and must be in communion with the Church of England. This legislation was enacted to ensure that the sovereign would not be a Roman Catholic, reflecting the historical religious tensions in Britain during that era. The monarch serves as the Supreme Governor of the Church of England, a role that necessitates adherence to the Protestant faith as a constitutional requirement for succession.