Answer is (whited out): B - Urbana 500


I don't remember the name of the episode, but BB's alt-mode name was revealed to us when BB's transformation cog got stolen by NEST, making him no longer able to transform. Later at the base, Raf tries to cheer up a depressed Bumblebee. Unfortunately, a commercial for the Urbana 500 plays on the TV and it causes BB to chuck a hissy-fit.