Which sentence contains an action verb? Those waffles are cold.
My hamster is tired.
The old lady was amused.
Samantha and Stephanie arrived at the party late.

Samantha and Stephanie arrived at the party late.

Explanation:

It is the only one containing a action verb because all the rest don't contain action. They contain feelings and emotions. The sentences before it are not active.

Examples of action verbs are arrived, run, jump, swim sprint, etc.

the answer is

not sure maybe the subject closer to it or subject-verb agreement