Read the passage:

he put his house in order once more got out his books and prepared for a tussle with a difficult mathematical problems. which context clue is most helpful in determining the meaning of tussle

A. Assume that tussle is a synonym of books.

B. Assume that tussle is an antonym of books.

C. Assume that tussle is an antonym of problem.

D. Assume that tussle is a synonym of problem.