A car is moving in a circular path of radius \( 100 m \) with a speed of \( 20 m / sec \). If its speed is increasing at the rate of \( 3 m / sec ^{2} \), the resultant acceleration will be -
(A) \( 2 m / sec ^{2} \)
(B) \( 5 m / sec ^{2} \)
(C) \( 7 m / sec ^{2} \)
(D) \( 4 m / sec ^{2} \)