The attendant vaulted into the car, backed it up with insolent skill, and put it where it belonged. (“the secret life of walter mitty") (1 point)
a hijacked
b jumped
c raced
d slinked

b. jumped.

To "vault" means to jump or leap to or from a position or over something. In this case, the sentence explains that the attendant jumped into the car. The most likely reason why the author decided to use this word is that it has a connotation of grace and skill. This contributes to the tone of action that the author tries to achieve in the text.

caliban is prospero's slave in the shakespear's play "the tempest"