Final answer:
The manager of the car wash thinks that Mark is responsible for the trike stunt.
Step-by-step explanation:
In the question, the 'manager of the car wash' is mentioned, which indicates that this question is related to a fictional story or play, implying that the subject is English. The grade level of this question is high school.
The manager of the car wash thinks that the trike stunt was done by 'Mark'.