Which form changes a statement about homework into a question?

The correct form for changing a statement about homework into a question is the one that utilizes the auxiliary verb "has" to seek confirmation about the completion of the homework, making it appropriate for a more formal context.

When transforming a statement into a question, the structure typically involves placing the auxiliary verb before the subject, which helps clarify that the speaker is seeking information. In this case, "Has she finished her homework?" directly asks whether the action has been completed, conveying the intent of inquiry clearly and concisely.

This form stands out as it effectively maintains grammatical accuracy while expressing the question's nature. The other options may have varying degrees of informality or may not structure the question in a way that directly elicits a response, thereby not fitting the requirement for transformation as effectively as the selected option.