Please hel me will give brainless What is the interval between the first and second A on a piano keyboard?

A. harmony

B. melody

C. octave

D. scale

C, octave

harmony:2 notes simultaneously X
Melody: collection of musical tones X
Octave: from a low note to its higher such that A to A, B to B, and so on
Scale: all notes between slim such that ABCDEFGA

Difference between octave and scale is the actual notes on a scale is between at least one octave. However, an octave does not contain a scale. Thus taking about 2 different A’s you say they’re an octave apart NOT a scale apart because octave is the ratio and the scale is a product of that ratio

Iwant to say it might be a or c my friend

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