They are both correct grammatically. Only A is logical and makes sense, however. B is illogical because unexpected accidents are (usually) the result and not the cause of careless driving.
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Hossien JazayeriWhich is grammatically correct?Grammatically, both sentences are correct. However, I believe that you will want to use sentence A. Here's why:
AnonymousThey are both correct grammatically.B is not correct grammatically. It would be if were ... by many unexpected accidents... . But, as you correctly said, it would be illogical.
fivejedjonB is not correct grammatically. It would be if were ... by many unexpected accidents... . But, as you correctly said, it would be illogical.You are right! I completely missed the missing 'by' as well!