The statement that best explains why people in West Africa eat manioc is:
Europeans introduced manioc to Africa after encountering it in America.
Manioc (also known as cassava) is native to South America and was brought to Africa through the Columbian Exchange, which facilitated the transfer of crops, animals, and people between the Americas, Europe, and Africa following Columbus's voyages. It became a staple food in various parts of Africa due to its adaptability and high yield.