Probably D. After all,it’s the most prolific time of his life(I am not sure tho)
Calculators are to past generations as computers are to current generations.
Reference: the action of alluding or mentioning something; source; things that you have used for an assignment
(Last sentence) Do you believe the story about the president (George Washington) who, as a boy, admitted to his father that he cut down the cherry tree?