Final answer:
The arrow indicating the direction of centripetal force is the one that points towards the center of the circular path, affirming that centripetal force is center-seeking.
Step-by-step explanation:
The direction of centripetal force on an object represented by a dot is always towards the center of the circular path it is moving on. This is because centripetal force is a center-seeking force. Therefore, when an arrow represents centripetal force in a diagram, it points radially inward towards the center of the circle. Hence, the correct answer is that the arrow that indicates the direction of the centripetal force is a. In the direction of the centripetal force. This can be further understood by recalling that centripetal means "center seeking" and centripetal acceleration is always directed towards the center of the circular path.