Which of the following is a synonym for the word "shut"?

The word "shut" means to close something, often to stop it from being open. Therefore, "close" serves as a direct synonym because it conveys the same action or state as "shut." When you shut a door, you are closing it, creating a similar meaning and usage in various contexts, such as shutting a book or the curtains.

While "lock" and "seal" can imply a more secure or enclosed condition, they do not match the straightforward meaning of "shut" in the same way that "close" does. "Open," on the other hand, is the antonym of "shut," depicting the opposite action. Thus, "close" is the most accurate synonym in this case.