Which statement from this passage could be used as evidence to suggest that the columbian exchange benefited the old world much more than the new world?

smallpox was enormously immportant until quite modern tmes, until the middle of the 20th century at the latest. so i was chasing it down, and i found myself reading the original accounts of the european settlements in mexico, peru, or cuba in the 16th, 17th, and 18th there are excellent english translations dating back for generations. 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. i really didn't realize that i was starting a revolution in historiography when i got into this subject.

- alfred w. crosby on the columbian exchange, 2011

a. so i was chasing it down, and found myself reading the original accounts of the european settlements in mexico, peru, or cubaa in the 16th, 17th, and 18th centuries.

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.

c. smallpox was enormously important until quite modern times, until the middle of the 20th century aat the latest.

d. i really didn't realize that i was stating a revolution in historiography when i got into this subject.

-apex