What feature in Google Forms allows you to restrict responses?

The correct answer is "All of the Above" because each of the features mentioned contributes to the ability to restrict responses in Google Forms.

Question Types allow educators to design questions that limit the kind of responses users can provide. For example, a multiple-choice question confines respondents to select only one option, thus inherently controlling the types of answers received.

Response Validation provides a more robust mechanism to enforce specific criteria for responses, such as requiring a number to fall within a certain range or ensuring that the text input meets particular requirements. This feature helps to ensure that responses conform to expected formats or values.

Form Settings offer more global controls over how forms collect responses. Educators can set limits on who can respond, such as requiring sign-in to a Google account, which can restrict responses to a defined group of individuals, like students at a specific institution. Additionally, settings can enforce one response per person or allow respondents to edit their answers after submission.

Therefore, by utilizing a combination of these features, an educator can effectively manage and restrict responses on their Google Form, making "All of the Above" the appropriate choice.