The captain of the hockey team broke his leg . . . . . . . . the final match. A. upon B. by C. during D. on

The correct answer is C. during.

The other options are incorrect because they do not accurately describe the time when the captain of the hockey team broke his leg.

• Option A, upon, means “at the beginning of.” This is not accurate because the captain of the hockey team did not break his leg at the beginning of the final match.
• Option B, by, means “before.” This is not accurate because the captain of the hockey team did not break his leg before the final match.
• Option D, on, means “at a particular time.” This is not accurate because the captain of the hockey team did not break his leg at a particular time during the final match.

The only option that accurately describes the time when the captain of the hockey team broke his leg is C, during. The captain of the hockey team broke his leg during the final match.