Context: Okay so i was at my friend Kendra 's house with my friend sam . We were playing around like always , and then Kendra pounced on me and her knee landed right on my ribs . At the moment i could not breathe and i was on the ground trying to mouth help me .

Question: Why could I not breathe ?
Options:
0. None of the above choices .
1. Because I was on the ground .
2. Because I just received an impact on my chest .
3. Because my friend is Kendra .
Answer: 2