Choose the option that is opposite in meaning to the word or phrase underlined. The commissioner thought that the proposal would fall through.

The word or phrase underlined is "fall through." The term "fall through" generally means that a plan, proposal, or project does not happen or fails to be completed as intended. It often refers to something that was expected to happen but did not.

To find the opposite meaning, we need a word that describes a proposal being successful or completed as planned.

Let's review the options given:

• Succeed: This means to achieve something as planned or to accomplish a goal successfully.
• Be discarded: This means to throw away or reject something, which shares a negative aspect, similar to "fall through."
• Be written off: This means to consider something as a failure or lost cause, which also shares similarity with "fall through."
• Fail: This is a synonym for "fall through," indicating lack of success.

The correct opposite of "fall through" is "succeed," as it implies the proposal is achieved or completed successfully, opposite the meaning of failing or not happening.