Cytology studies cell structure and function, distinct from physiology (body functions) and anatomy (body structures), per biology texts (e.g., Campbell Biology).

Solar energy includes visible light, infrared, and ultraviolet, all forms of electromagnetic waves, as per solar physics (e.g., NASA solar studies).

Australia won the ICC Men's T20 World Cup 2021 held in the UAE by defeating New Zealand in the final.

The Ministry of Federal Education officially launched the Single National Curriculum (Phase 1 for Grades 1–5) in August 2021.

The first Summit for Democracy was organized virtually by US President Joe Biden from Washington, D.C., in December 2021.

COP26 took place in Glasgow, Scotland, United Kingdom, in November 2021.

The United Nations Millennium Development Goals (MDGs) encompass a wide range of objectives, including eradicating extreme poverty and hunger, achieving universal primary education, promoting gender equality, reducing child mortality, improving maternal health, combating HIV/AIDS, ensuring environmental sustainability, and fostering global partnerships 1.

Hamas (Harakat al-Muqawama al-Islamiyya or Islamic Resistance Movement) was founded in December 1987, at the beginning of the first Intifada [2](https://www.britannica.com/topic/Hamas)[3](https://www.dni.gov/nctc/groups/hamas.html)[5](https://www.wilsoncenter.org/article/doctrine-hamas). Sheikh Ahmed Yassin is widely recognized as the principal founder and spiritual leader of Hamas [2](https://www.britannica.com/topic/Hamas)[4](https://www.ebsco.com/research-starters/ethnic-and-cultural-studies/hamas)[5](https://www.wilsoncenter.org/article/doctrine-hamas)[6](https://en.wikipedia.org/wiki/AhmedYassin). Abdel Aziz al-Rantisi is also mentioned as a co-founder [6](https://en.wikipedia.org/wiki/AhmedYassin). Yasser Arafat was the leader of the PLO, a rival secular organization [2](https://www.britannica.com/topic/Hamas). Ismail Haniyeh and Khalid Meshaal are prominent Hamas leaders who rose to prominence later; Haniyeh became Prime Minister of the Palestinian Authority in 2006, and Meshaal became head of Hamas's political bureau in 1996 [2](https://www.britannica.com/topic/Hamas). Since Sheikh Ahmed Yassin is not listed among the options, "None of these" is the correct answer.

SilkAir was the regional airline subsidiary of Singapore Airlines, based in Singapore [2, p19]. It primarily served short to medium-haul destinations in the Asia-Pacific region. (Note: SilkAir was fully integrated into Singapore Airlines in 2021, but was a distinct entity in 2010).

NASA, in partnership with ESA and CSA, launched JWST on 25 December 2021 from French Guiana and began science operations in 2022.