Answer:
the answer would be D
Step-by-step explanation:
classical periods were times of great discovery and advancement in many different fields of work and study; the Renaissance period is a good example of this
think of it as like the 'classics', as people usually call it. classical music, classical art, Michealangelo's paintings in the Sistine Chapel, those statues of naked people that ever so slightly disturb you whenever you pass them in the street, etc (also the other answers just dont make sense anyway so youre all set)
hope this helps :)