To what tradition does the Met Museum curator compare Damien Hirst's The Physical Impossibility of Death in the Mind of Someone Living (1991)? A. collage
B. Enlightenment scientific art C. vanitas
D. Victorian death photography

i would think b and c

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.  

jan tschichold, the son of a designer and sign painter