A is the surface on which the artist paints - for example a wall, a panel of wood, paper, or a canvas.

canvas

Explanation:

a canvas is the surface on which the artist paint

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.