Asequence is a melodic pattern
a. repeated at different pitch levels.
b. containing two phrases of unequal lengths.
c. containing a series of notes that add up to a recognizable whole.
d. that always increases in pitch along a scale.

A. Repeated at different pitch levels.

Explanation: When songs are composed, there is a sequence that is repeated at least once throughout a song.

Hope this helps! :)

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.