Of the Following,who Would Not Be Charged as an Accomplice

Of the following,who would not be charged as an accomplice?

A) a person who lends affirmative assistance to another in the commission of a crime
B) a getaway driver who did not think his partner in crime was going to pull a gun on the store clerk
C) a dealer who provides illegal weapons and instructions on their use in a crime
D) a librarian who responds to the principal's request for a book on how to make a bomb