No improvement or correction is required
Answer:
It is both an <u>Action Verb</u> and a <u>Linking Verb</u>
Explanation:
The word became is a true linking verb in that it always links the subject to extra information and it's an action verb because if you are "becoming something" you're committing an action.
I'm not entirely sure what you're talking about, but perhaps you are talking about a yam?