The car driver in front stopped so suddenly. Therefore, the accident happened.
A. If the car driver in front hadn’t stopped so suddenly, the accident can have happened.
B. If the car driver in front hadn’t stopped so suddenly, the accident can’t have happened
C. If the car driver in front hadn’t stopped so suddenly, the accident could have happened.
D. If the car driver in front hadn’t stopped so suddenly, the accident couldn’t have happened.

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