Which of the following statements accurately describes the contribution of eratosthenes?

a: he is considered to be the "father of history."
b: he believed that all diseases have natural causes.
c: he wrote comedies such as "the clouds" and "the birds" to be performed in a large outdoor theaters.
d: he estimated the earth's circumference.

Which of these was one of the most important aspects of washington's presidency a. he did not consider how his actions would affect later presidents b. he came to believe that political parties would be good for the country. c. he insisted that congress make specific rules about the duties of the president d. he did not take advantage of the opportunity to keep the power the country offered him.