When Mitty brings his car in because he cannot remove the chains and the garage man grins at him, Walter Mitty thinks, "The next time, I'll wear my right arm in a sling; they won't grin at me then." What is most likely inferred about Walter from his words? He is embarrassed by his lack of ability.

He decides to avoid this garage the next time.

He is frustrated that his arm is injured.

He is disappointed because he does not understand why the garage man is grinning.