What does “quarter note = 120” mean?

"Quarter note = 120" is a tempo (speed) recommendation. It suggests that the music which follows should be performed at a tempo of 120 quarter notes per minute

It means the tempo is 120 and that the quarter note gets the beat. Hope this helps!

Iwant to say it might be a or c my friend

Iwould say overhead, b/c front would shine in their face, and might mess up the picture, especially if taken by a so either front or overhead, but i'm leaning towards overhead