A 13-Kg Pendulum Hangs from the Roof of a Stationary Car

A 1.3-kg pendulum hangs from the roof of a stationary car. The car accelerates, and the string of the pendulum now makes an angle of 13 - (relative to its initial position) . What is the acceleration of the car?

A) 4.5 m/s $2$
B) 4.1 m/s $2$
C) 3.2 m/s $2$
D) 2.3 m/s $2$