She was wearing a helmet when the accident happened. Therefore, she wasn't injured.
A.If she hadn't worn a helmet when the accident happened, she wouldn't have been injured.
B.If she hadn't been wearing a helmet when the accident happened, she would have been injured.
C.If she had worn a helmet when the accident happened, she would have been injured.
D.If she hadn't been wearing a helmet when the accident happened, she wouldn't have injured.

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