There are 12 in the united states, which from the district courts.
a. congressional districts . . interview judges
b. regional circuits . . hear cases on appeal
c. supreme courts . . hear cases on appeal
d. state supreme courts . . draw their legal reasoning

The correct answer is B, because there are only 12 regional circuits organized from 94 US judicial districts, and they hear cases on appeal. There are currently 435 "congressional districts", there is only one "supreme court", and there are "state supreme courts" in each state.

"There are 12 regional circuits in the United States, Which hear cases on appel from the district courts."

so your answer is b. regional circuits . . . hear cases on appeal