How many letters make up the music alphabet

7 letters

Explanation:

Even though the music alphabet is only made up of 7 letters, that doesn't mean that there are only seven notes. There are actually 12. The seven letters represent natural notes.

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.

eurasia because it is europe and asia