Tristan Is Trying to Hang a Picture on His Dorm

Multiple Choice

Tristan is trying to hang a picture on his dorm wall and has found a nail but cannot locate a hammer.Although he searches his dorm room,he eventually gives up on hanging the picture because he can't find anything to pound the nail into the wall.What Tristan failed to consider was that he could have used a shoe or his baseball bat to pound the nail into the wall.Tristan has experienced what obstacle to problem solving?

A) Salience of surface similarities
B) Mental set
C) Functional fixedness
D) Availability heuristic