. Two cars initially at rest start a race. Car A accelerates at constant rate a, while car B moves with zero initial acceleration such

Two cars initially at rest start a race. Car A accelerates at constant rate a, while car B moves with zero initial acceleration such that rate of change of acceleration is constant. At t = 1 s both  the cars are at same position. Then at t = 0.5 s

            (a) car A is ahead                                            (b) car B is ahead

            (c) both are at same positions             (d) data insufficient