Explanation:

- Option 1: An easy task

This is indeed the meaning of the idiom "child's play." It refers to something that is very simple or easy to accomplish, similar to how children's games are uncomplicated.

- Option 2: Cricket

This option is unrelated to the idiom. Cricket is a sport played between two teams, but it has no connection to the idiom "child's play."

- Option 3: A restricted playground

This refers to a limited area where children play. It doesn't describe the idiom.

- Option 4: Children’s drama

This could imply a play or theatrical performance put on by children. However, it does not convey the meaning of the idiom.

Correct Answer: Option 1: An easy task