Correct Answer: Constrain

Solution : The correct choice is the fourth option .

Explanation:

The word restrain means to hold back, limit, or prevent, and constrain is a synonym that aligns with this meaning. Constrain is the most appropriate synonym, as it shares a similar meaning of restricting or limiting.

The meanings of the other options are as follows:

• Allow suggests giving permission rather than restricting.
• Assist means to help or support.
• Free means to release or liberate from a state of confinement, restriction, or restraint.