The answer is B, Pat collected five cars each year for seven years (There were typos but I am assuming this is what it was)
A represents 5 + 7, since he collects 5 cars and then adds 7 more the next year.
C represents 35 - 7, since he had 35 cars and then subtracted (gave away) 7 of them.
D represents 5 + 35, since he had 5 cars and then added 35 more.