The Columbian Exchange refers to which of the following?

• A. The transfer of plants, animals, and diseases between the Americas and Afro-Eurasia
• B. The spread of democracy across the Atlantic
• C. The exploration of coastlines by European powers
• D. The exclusive exchange of gold and spices

Answer: (A)

The main idea tested is the large-scale ecological and cultural exchange that happened after sustained contact between the Americas and the rest of the world. The Columbian Exchange refers to the transfer of plants, animals, and diseases between the Americas and Afro-Eurasia. This means crops such as maize, potatoes, tomatoes, peppers, cacao, and tobacco moving to Europe, Africa, and Asia, while animals like horses, cattle, pigs, and chickens were introduced to the Americas. It also includes the spread of diseases such as smallpox, measles, and influenza, which had profound impacts on Indigenous populations.

This broad, multi-directional exchange reshaped diets, agriculture, and societies on both sides of the Atlantic and helped drive demographic and cultural changes worldwide. The other descriptions don’t fit as well because they focus on political ideas (democracy), specific activities (coastal exploration), or only one type of trade (gold and spices) rather than the wide transfer of living things and diseases.