Karl Was Posting Signs on Campus and He Ran Out

Multiple Choice

Karl was posting signs on campus and he ran out of tape to put up the last sign.He could not figure out another way to put up the sign even though he was chewing gum and could
Have used the gum to put up the sign.Karl most likely did not come up with this solution
Because of

A) framing.
B) functional fixedness.
C) restructuring.
D) lack of insight.