Which statement from this passage could be used as evidence to suggest that the Columbian Exchange enabled the inhabitants of the New World to work more efficently

The answer could either be this: The invaders had more pulling power - not only horses but also oxen and donkeys.

Or This: B. Practically all of them will get into a page or two or ten about the decimation of American Indians, or a page about how important maize is when all European crops fail, and things like that.