(a) Possible
When a ball is thrown up, at the highest point, it has zero velocity, although it will have constant acceleration due to gravity, which is equal to 9.8 m/s2.
(b) Possible
When a car is moving in a circular track with constant speed, it is accelerating due to change in direction of motion.
(c) Possible
A car is moving in a circular track, its acceleration is perpendicular to the direction of motion.