Which of these was a negative effect of the Colombian exchange?

A) the introduction of the potato to Europe

B) the introduction of coffee to South America

C) the introduction of disease to the new world

D) the introduction of cow and donkey to the new world

35 is your answer because i looked it up

i do believe its (d) it allowed the government to offer pioneers sixty acres of western land if they lived on it and made improvements to it.

explanation: signed into law in may 1862, the homestead act opened up settlement in the western united states, allowing any american, including freed slaves, to put in a claim for up to 160 free acres of federal land. by the end of the civil war, 15,000 homestead claims had been established, and more followed in the postwar years