What are 4 examples of steady beat?

In Music, Backbeat is loud, has a steady rhythm accenting beats 2 and 4 in 4/4 meter. It's a syncopated accentuation on the off beat.

Explanation: I hope this help.

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.