How did Hypatia contribute to the study of philosophy? A. She became a teacher at Alexandria.

B. She improved upon the works of Plato.

C. She was educated in both science and mathematics.

D. She studied Euclid’s theories and proved them incorrect.

the answer is )multiethnic

the answer is prolly b

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!