plzzz help me !! a five rate star will be given and a thanks....etc

which sentence uses vocabulary word incorrectly?
a. At the peak of the concert, there was a sudden 'exploit' from the percussion section.

b. Even in the face of fear, make a firm 'resolution' to never lose control.

c. I was intrigued by the 'esteem' the little boy felt for both his pets and his toys.