Think about different kinds of communities from smallest to largest:
- Family — the people who live with you and care for you.
- School community — students, teachers, and staff at your school.
- Village community — everyone who lives in your village or town.
- World community — all the people who live on Earth.
Because the world community includes every family, every school, and every village, it is the biggest community we belong to. Therefore the correct answer is: A. The world community.
Note: Option C, “the family of humankind,” also talks about all humans and can mean the same idea, but the choice that directly names the largest community is A, the world community.