Which of the following was one of saint augustine's key ideas?
a. his belief in monastic celibacy
b. his doctrine of christ's divinity
c. his doctrine of original sin
d. his belief that the pope was peter's successor

The answer that was one of Saint Augustine's key ideas was C. his doctrine of original sin.
He claimed that the original sin comes from the fall of man - when Eve committed the crime of tasting the apple, which led to her and Adam being expelled from Eden. 

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.