Final answer:
Arnold blows the horn four times when he pulls into the driveway.
Step-by-step explanation:
Based on the given question, we can infer that Arnold performs a specific action when he pulls into the driveway.
Out of the given options, the action described in option C, Blows the horn four times, seems to be the most appropriate answer.
This is because when someone pulls into a driveway, honking the horn can be a way to signal their arrival or alert others in the vicinity.