The correct answer is C. She requested her mother to cook her something nice that day.
A request is a polite way of asking for something. It is usually expressed in a tentative way, using phrases such as “please” or “if you could.” In this case, the speaker is asking her mother to cook her something nice that day. She is not demanding or ordering her mother to do so, but is simply making a polite request.
The other options are incorrect because they do not accurately reflect the speaker’s tone of voice or the meaning of her words. Option A is incorrect because it suggests that the speaker is telling her mother to cook her something nice. However, the speaker is not using a commanding tone of voice, but is simply making a polite request. Option B is incorrect because it suggests that the speaker is ordering her mother to cook her something nice. However, the speaker is not using an imperative tone of voice, but is simply making a polite request. Option D is incorrect because it suggests that the speaker is asking her mother if she could cook her something nice. However, the speaker is not asking for permission, but is simply making a polite request.