In this case, the correct word is break because it refers to a period of rest or pause, which is the logical choice when someone is exhausted and needs to rest.
Step 1: Understanding the options.
- (A) brake: A brake is a device used for stopping or slowing down a vehicle. This doesn't fit the context of taking rest.
- (B) break: This is the correct option, as it means a rest or pause, which fits the context of exhaustion.
- (C) breech: A breech refers to the rear end or bottom of something, typically used in the context of a gun or childbirth. It is not suitable for this context.
- (D) breach: A breach refers to a gap or violation of a law, contract, or security, which doesn't fit the meaning of needing a rest.
Step 2: Conclusion.
The correct word to complete the sentence is break, as it means a rest period.
Final Answer: break.