Task: Text Completion
Input (English): Sentence1: Nick took his dog for a walk last Saturday. Sentence2: During the walk, his dog saw several other dogs. Sentence3: He was not well-socialized, so he started barking at them. Sentence4: It was a long and painful experience for both of them. 
 (A) Sam was very amused by his dog's behavior. (B) Nick decided to take his dog to a trainer.
Output (English): A