The young man was surprised to find that his experience as a tutor had been used as the basis for the protagonist in a short story written by a former girlfriend.

• A. The young man was surprised to find that his experience as a tutor had been used as the basis for the protagonist in a short story written by a former girlfriend.
• B. his experience as a tutor had been used as the basis for the protagonist's in
• C. his experience as a tutor being used as the basis for the protagonist of
• D. that his experience as a tutor had been used as the basis for events in the life of the protagonist in