Which statement best explains how terrace farming differed from slash-and-burn agriculture?
a. terrace farming was used to grow crops in mountain areas, while slash-and-burn agriculture was used to grow crops in rainforests.

b. terrace farming was used to grow crops in rainforests, while slash-and-burn agriculture was used to grow crops in mountain areas.

c. terrace farming allowed farmers to grow a variety of crops, while slash-and-burn agriculture could only be used to grow corn.

d. terrace farming could only be used to grow corn, while slash-and-burn agriculture allowed farmers to grow a variety of crops.