Which is the best definition of the colombian exchange?

a. the name of columbus’s last expedition to north america
b. the transfer of diseases from native americans to europeans
c. the trade routes for goods between north america and europe
d. the movement of cultures and goods between eastern and western hemispheres.

C. The trade routes for goods between North America and Europe.

Explanation:

The Colombian exchange refers to a large exchange of plants, animals, and even diseases between Europe and the Americas.  

Europe sent to the Americas: cows, horses, chicken, wheat, smallpox, etc.

America sent to Europe: potatoes, tomatoes, tobacco, corn, etc.

These are just some of the goods that were a part of this exchange.