Which statement accurately describes an important effect of the columbian exchange on the americas?

a.
farming was introduced to the americas for the first time since the last ice age.

b.
architecture was made possible for the first time in american civilizations.

c.
european, asian, and african plants became a part of the american environment.

d.
american civilizations shifted from agricultural economies to pastoral economies.

it's C i checked myself

To my mind the correct option is C. European, Asian, and African plants became a part of the American environment.

The Columbian exchange, also called the Columbian interchange, a name tha received for Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the Americas, West Africa, and the Old World in the 15th and 16th centuries.

i believe your answer is d)

"germany's geographic location was an advantage when it was on the offensive in the war because it was situated next to an extremely wide river, the rhine, which was difficult for the allies to cross."