A child walks across merry-go-round A with a constant speed u relative to A. The merry-go-round undergoes

Question:

A child walks across merry-go-round A with a constant speed u relative to A. The merry-go-round undergoes fixed axis rotation about its center with a constant angular velocity ω counterclockwise.When the child is at the center of A, as shown, what is the direction of his acceleration when viewed from above.

(a) →

(b) ←

(d) ↓

(e) The acceleration is zero.