Which of the following statements is INCORRECT？A．The speed limit of the extremely sharp cu

Which of the following statements is INCORRECT？

A．The speed limit of the extremely sharp curve is 30 miles per hour.

B．The straightway along the river requires a speed limit of 70 miles per hour.

C．Rescue workers found that seven cars had jumped into the river in the accident.

D．The driver stepped on the brakes quickly but they just didn"t work.

请帮忙给出正确答案和分析，谢谢！