Answer:
e. Any behavior that is accidentally reinforced is more likely to be repeated.
Explanation:
Marvin's behavior of wearing a red shirt and not falling in the test acts as a reinforcement for him. Although he usually fall in the test but that day when he wore a red shirt he did not. Though it was an accident it caused the repetition of the occurring action (that is wearing a red shirt). The whole phenomenon suggests that an accidental reinforcement more likely to cause a repeated behavior.