You _______ to eat if you don't feel like it.
- A. haven't
- B. needn't
- C. mustn't
- D. don't have
Explanation
“Don’t have to eat” expresses a lack of obligation and correctly places to after have. Needn't is also a modal of no obligation, but it is followed directly by the verb, so “needn't to eat” is ungrammatical.