Which prompt would be best addressed with a compare-and-contrast structure?

A. In a letter, explain reasons you believe students should walk to school more often.

B. Write an essay recounting the history of the American space exploration program.

C. Research the history of the colonization of the American
continent. Explain how the colonies grew over time.

D. Explain the similarities and differences between African and Asian elephants, including facts about diet and habitat.