Choose the option that best replaces the phrase in bold without changing the meaning of the sentence below:

The manager decided to throw in the towel after the project failed despite all the efforts.

The phrase "throw in the towel" means to give up or admit defeat, especially after trying hard without success. It comes from boxing, where a trainer throws in the towel to stop the fight.

So, "admit defeat" (Option C) is the best choice because it matches the idea of giving up after a failed effort. "Stopping the project" (Option A) is close but doesn't fully capture the idea of admitting defeat, which is why it’s not the best fit.