Can I say , Yesterday was a rainy day . John fell down and hurt his knee . ( a ) John tried to walk but failed . Luckily , he saw two scouts was on the way to him .
According to the above context, choose the best option to answer the following question.
Question: Why may have John hurt his knee ?
Options:
A. The scouts pushed him .
B. He slipped on a wet surface .
C. He was pushed by the scouts .
D. He was fooling around .


B