Context: If he fails to have enough concentration , he might produce an effect different from the desired one which can be potentially dangerous . The sole exception to this energy restriction are his wings which he can call forth at will without much problem . He is n't quite sure how they work , but extensive use is very taxing to his body .
Question: What may be the reason for not being sure how the wings work ?
Option 0: The wings are new .
Option 1: They did n't know they had them for a long time .
Option 2: They were told they did n't have wings .
Option 3: None of the above choices .
Answer: 0