An artist who places a row of trees extending from the lower left side to the upper right in a painting helps to achieve unity by
a. variety
C. continuation.
b. proximity
d. similarity

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 answer is chicken breast with a green salad and a serving of vegetables.