Correct Answer: Subtract

Solution : The correct answer is the first option.

The word that is opposite in meaning to "Annex" is "Subtract."

The term "annex" refers to the action of adding or attaching something, often territory or additional space, to a larger or main structure. On the other hand, "subtract" involves the action of taking away or deducting, which is the opposite of adding.

The meanings of the other options are as follows:

Profuse: This means abundant or overflowing.

Protract: This means to prolong or extend.

Propose: This means to suggest or put forward.

Therefore, the correct antonym for annex is subtract.