Which period of music was the most diverse?

a. middle ages
b. renaissance
c. romantic period
d. twentieth century

the answer is b. i'm positive it's that answer.

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.