Select the most appropriate meaning of the underlined idiom.

He was on cloud nine after passing the test.

Very happy

The correct answer is OPTION 2 - VERY HAPPY

The most appropriate meaning of the underlined idiom "on cloud nine" is very happy.

The idiom "on cloud nine" is used to describe someone who is extremely happy and excited. It is often used to describe someone who has achieved something that they have been working towards for a long time.