Final answer:
The statement that requires an amendment to the outcome is "I don't have a clue how this thing goes on and comes off," as it reveals the client does not understand the prosthesis application technique.
Step-by-step explanation:
The client's statement that signals a need to amend the outcome, "After attending an educational session, client will demonstrate correct technique for applying his prosthesis," is C) "I don't have a clue how this thing goes on and comes off."
This statement directly addresses the client's lack of understanding of the prosthesis application technique, which is the focus of the outcome.
Statements A and B express the client's feelings about wearing the prosthesis, which, while important for overall adaptation, do not directly relate to the technical skill of applying the prosthesis.
Statement D refers to not understanding the technology behind the prosthesis, which could be addressed in additional education but isn't about the application technique itself.