Two cars are traveling at the same constant speed v. As the drawing indicates, car A is

Question:

Two cars are traveling at the same constant speed v. As the drawing indicates, car A is moving along a straight section of the road, while car B is rounding a circular turn. Which statement is true about the accelerations of the cars?
(a) The acceleration of both cars is zero, since they are traveling at a constant peed.
(b) Car A is accelerating, but car B is not accelerating.
(c) Car A is not accelerating, but car B is accelerating.
(d) Both cars are accelerating.