Select the idiom that can correctly replace the underlined part of the given sentence.

It was a very important meeting, but I stayed cool as ice because I knew our product was the best.

cool as a cucumber

The idiom that can correctly replace the underlined part of the given sentence is (2) cool as a cucumber.

The other options do not fit the context of the sentence.

• Cool as a cake means to be calm and collected.
• Cool as a carrot does not make sense.
• Cool as a cabbage does not make sense.

The idiom "cool as a cucumber" is used to describe someone who is calm and collected in a difficult or stressful situation. In the given sentence, the person is calm and collected in a very important meeting because they know their product is the best.