Write a multi-choice question for the following article: Article: The 30-mile road that runs through the mountains of Willie Valley makes most drivers' hands sweat. But Andersen, a 46-year-old father of four, wasn't expecting any trouble on the road last New Year's Eve, when he set off for a ski trip to the Bear Mountains with nine-year-old daughter Mia, four-old son Baylor, and nine-year-old neighbor Kenya. Andersen had driven through the Valley hundreds of times over the years. The weather was fine. But the higher they drove, the more slippery the road became. Rounding a sharp U-turn, Andersen saw a heavy truck off the road and immediately hit his brakes. In a minute, the car was going at 25 miles per hour down the mountain before falling down from a ten-foot dam into the extremely cold Logan River. The crash had broken a few windows, and within seconds, the car was filled with water. "It was frightening that we were going fast into deep water," remembers Andersen, a soft-spoken manager. Having lost all sense of direction, Andersen began to search the freezing water for the kids. Mia had been right next to him in the front seat; now, in the blackness, he couldn't find her. "I thought, if I don't get out, maybe none of us are going to get out." Andersen got out of his seat belt, swam through a broken window, and, deeply and quickly, breathed air at the surface. That's when he saw a group of men, about ten in all, appear at the top of the dam. One after another, they rushed down into the water. Helping onto safety all the three children, they began to shout at the father, "Who else is in the car?" Andersen says respectfully, " _ ."
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Question: What might be the main cause of the car accident?Options:A The bad weather.B The high dam.C The sudden brake.D The heavy truck.Answer:C