Choose the best sentence that has the same meaning as the original one

1.
4 Choose the best sentence that has the same meaning as the original one.
You must never take your helmet off while you are riding a motorcycle.
A. If you are riding a motorcycle, you needn't wear a helmet.'
B. When you are riding a motorcycle, wearing a helmet is not a must.
C. You needn't wear a helmet whenever you are riding a motorcycle.
D. Helmets must be worn at all times when you are riding a motorcycle.
2. John was not here yesterday. Perhaps he was ill.
A. John needn't be here yesterday because he was ill.
B. Because of his illness, John should have been here yesterday.
C. John might have been ill yesterday, so he was not here.
D. John must have been ill yesterday, so he was not here.
3. People say that he died in the accident
A. It was said that he was died in the accident
B. It is said that he was died in the accident
C. He is said to have died in the accident
D. He is said to die in the accident