You must obey your parents.
- A. Your parents must obeyed by you.
- B. Your parents must been obeyed by you.
- C. Your parents must be obeyed by you.
- D. Your parents must being obeyed by you.
Explanation
After the modal must, the passive form is must be plus the past participle: “must be obeyed.” The other options use incorrect forms of be.
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