Which sentence uses an infinitive as the object of the verb?

a. as john crept through the sand, he came upon the best spot to surprise the unknowing criminals.

b. kit's writing was used to uncover the fraud that had been going on in the family business for years.

c. mr. brown arrived in time to offer the student body his expertise in community volunteering.

d. in the beginning of the story, allie goes to meet the people who will eventually her succeed.