Question

which of these people is telling you that theyre slowing down or stopping?

Explanation:

In driving hand signals, a downward - moving or extended - downward hand (or a hand signal indicating slowing/stopping) is recognized. The hand signal in option A (the hand is extended downward, a common signal for slowing down or stopping) matches the requirement. Other options: B is a waving (greeting or maybe indicating something else), C is a signal for turning left (extending the arm straight out), D is a signal for turning right (extending the arm and bending fingers in a way for right turn).

Answer:

A. The person in option A (with the hand extended downward from the vehicle) is indicating they are slowing down or stopping.