According to the lecture, some of diego rivera’s work belonged to the style/period known as
a. neo-classicism
c. modernism
b. impressionism
d. cubism

D  cubism

Explanation:

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.  

the style of music that was composed during the classical era was concerto grosso.