The correct answer is: A. UNFPA
The United Nations Population Fund (UNFPA) is the United Nations agency that deals with population and development. It was established in 1969, and its mission is to “achieve a world where every pregnancy is wanted, every childbirth is safe, and every young person’s potential is fulfilled.”
UNFPA works in over 150 countries and territories to promote reproductive health, gender equality, and the empowerment of women. It also provides technical assistance and funding to governments and other partners to support population and development programs.
UNDP, UNICEF, and UNESCO are also UN agencies, but they do not deal with population issues. UNDP is the United Nations Development Programme, which works to promote sustainable development. UNICEF is the United Nations Children’s Fund, which works to protect the rights of children. UNESCO is the United Nations Educational, Scientific and Cultural Organization, which works to promote education, science, and culture.