Task: Coherence Classification
Input (English): Sentence 1: Nick's kids wanted to be more musical. 
 Sentence 3: They started lessons and enjoyed them a lot 
 Sentence 4:  They practiced all year for their recital 
 Sentence 5:  They knew they would do great! 
 Option 1: He brought them a piano cd. 
 Option 2: He bought them a piano.
Output (English): Option 2