Select the most appropriate meaning of the given idiom.

A piece of cake

Something easy

The most appropriate meaning of the idiom "a piece of cake" is something easy.

The other options are incorrect.

• "Something serious" is not the same as something easy. Something serious is important or significant, while something easy is not.
• "Something difficult" is not the same as something easy. Something difficult is hard to do, while something easy is not.
• "Something amusing" is not the same as something easy. Something amusing is funny or entertaining, while something easy is not.

The idiom "a piece of cake" is used to describe something that is very easy to do. For example, you might say that passing your driving test was a piece of cake, meaning that it was very easy.