Bite the dust means to be defeated, fail, or die. It's commonly used in competitive contexts.

'Break the ice' means to initiate conversation or ease tension in an awkward situation.

This idiom means working late or studying hard, often for exams or important work.

The idiom means heavy rainfall. Option B correctly uses it in context.

'Hit the books' is a common idiom meaning to study hard, especially used by students.

This idiom means something happens very rarely or almost never. A blue moon occurs approximately every 2-3 years.

'Caught off guard' means surprised or unprepared for something unexpected.

'Beat around the bush' is correctly used. It means to avoid discussing the main point.

'Spill the beans' means to reveal a secret or tell someone something that was meant to be kept confidential.

'Piece of cake' means something is very easy to do. Option A correctly applies this idiom.