Contract most closely means:

• A. To hire someone to work under a contract
• B. To shrink
• C. To get smaller; to shrink
• D. To sign an agreement

Answer: (C)

Contract has more than one meaning in English. Here, it’s used as a verb meaning to become smaller or shrink. That sense is a natural fit because you’re focusing on size or amount changing, not on an agreement or employment. So “to get smaller; to shrink” is the closest match.

The other options relate to a different sense of the word: a formal agreement or signing that agreement. Those meanings describe what a contract is, rather than the action of decreasing in size. For example, a contract can be a written legal document, or the act of hiring someone under an agreement, but those don’t capture the idea of diminishing in size.