A Student Uses a Plumb Bob to Verify That the Doorjamb

Multiple Choice

A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle θ with the doorjamb. What is the acceleration of the car?

A) g sin θ
B) g cos θ
C) g tan θ
D) g θ
E) θ