单项选择题

Questions 17~20 are based on a conversation between a mother and her son about a funny thing happened to their friend Lyn. You now have 20 seconds to read the questions 17~20. Why was the old lady on her hands and knees in the middle of the road

A.She was run over by a car.
B.She was shocked to see a car crashing into a another.
C.She fell when crossing the road.
D.She was looking for her false tooth.