In the music style steppers, how many beats does the bass drum play per pressure?

I believe the answer is four beats but the bass drum usually hits on the third beat, but sometimes drummers play four on the floor.

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.