Select the most appropriate meaning of the underlined idiom in the given sentence.

He is completely at sea about where to invest his hard-earned money.

confused

The most appropriate meaning of the underlined idiom in the given sentence is >confused.<

The idiom "at sea" means to be confused or bewildered. In the sentence, the author is saying that the person is not sure where to invest his money and is feeling confused about the options available to him.

The other options are not correct.

• Sure: This does not mean confused.
• In shock: This does not mean confused.
• Committed: This does not mean confused.