The term High Renaissance refers to __________.

A. the period when Leonardo, Michelangelo, Raphael, and artist peers created their masterworks
B. the era when expansion of the cathedrals grew to new heights
C. the years following the Medici's control when the Church controlled the arts and commissions throughout the ducal courts
D. artists and works associated with the mountainous region of Italy, including the hills of Rome

Answer: A