PLEASE HELP ME I WILL MARK YOU BRAINLIEST AND GIVE YOU 20 POINTS!!!!

What contributions did Aristotle make during the Hellenistic era?

A-He was the director of the library in Alexandria.
B-He said that reason was the key to learning.
C-He promoted the use of questions to help students learn.
D-He estimated Earth’s circumference using geometry.
E-He classified the names of many animals.