Answer:
The theory that would best explain his willingness to always wash and clean his car before going out is A. Thorndike's law of effect.
Step-by-step explanation:
According to Edward Thorndike's law of effect, if a response in a situation is followed by satisfaction, it becomes more likely to happen recurrently in that same situation. In the situation of going out, Blake once - or more times - washed his car and noticed more friends wanted to ride with him. That fact probably caused satisfaction, happiness. Wanting to feel it again, Blake is more likely to wash his car every time he decides to go out.