Context: So I did . Then , at the bottom of the Coquihalla Highway , there was an East Indian fellow who got out of his truck scratching his head at the great plumes of smoke billowing out from the wheels of his trailer . Looks like he got an expensive lesson on why you 're not supposed to ride the brakes going down a hill .. I do n't feel sorry for him , but I am very glad nobody was hurt ... The rest of the trip to Van went without incident .

Question: What is the reason great plumes of smoke billowing out from the wheels of his trailer ?
Options:
0. None of the above choices .
1. The brakes were brand new and he was n't used to driving with them .
2. The tires were worn out .
3. He drove the truck in a gear that was too high down the slope .
Answer: 3