Sentence1: Kelly was skiing when suddenly she heard a large commotion behind her. Sentence2: She looked back and saw a wall of snow coming towards her. Sentence3: She panicked and started skiing faster down the slope. Sentence4: As the avalanche caught up to her she quickly jumped into some trees. 
 (A) Kelly grabbed a tree and hung on tight. (B) Kelly was able to ski uphill on the avalanche.
B