Which statements about photographs by Eadweard Muybridge are true?

A. They show people and animals in motion.

B. They were the first stop-action photographs

D. They could be animated in a zeotrope or animated and projected in a zoopraxiscope.

I assume these are your statements.

a chromatic scale uses the twelve tones of the octave, while a regular scale only uses eight, or seven different notes (as the first note is played twice)