Identify the Interrogative Pronouns from the given options: What were they able to understand?

☐ What

☐ They

☐ were

☐ able

What

Explanation:

The interrogative pronoun in that sentence is what. Interrogative pronoun is a word that is used to ask a question, such as what, when, where, who, whether, whom, which, whose, why, and how. They are mostly called the "wh" words because most starts with wh.