. When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts

• (A):in the backward direction on the front wheel and in the forward direction on the rear wheel.
• (B):in the forward direction on the front wheel and in the backward direction on rear wheel.
• (C):in the backward direction on both the front and the rear wheels
• (D):in the forward direction on both the front and the rear wheels.