Suppose That a Car Traveling to the East (+X Direction)begins

Multiple Choice

Suppose that a car traveling to the east (+x direction) begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?

A) Its acceleration is in the +x direction.
B) Its acceleration is in the -x direction.
C) Its acceleration is zero.
D) Its acceleration is decreasing in magnitude as the car slows down.