Find the correct meaning of the idiom in quotation marks.
Rita was "happy as a clam" when she heard that she is going to Disneyland.

Answer: D. To be very happy.

The correct meaning of the idiom "happy as a clam" is D. To be very happy.
Explanation
The idiom happy as a clam is a common expression used to describe someone who is extremely pleased, content, or satisfied. The full version of the phrase is "happy as a clam at high water," because clams are safest from predators when the tide is high and they cannot be easily dug up

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