Task: Coherence Classification
Input (English): Sentence 1: Joe was thinking about taking a walk. 
 Sentence 3: He sat at his computer while thinking about walking 
 Sentence 4:  But it began getting dark 
 Sentence 5:  He decided not to walk 
 Option 1: But he wasn't sure where his walking shoes were. 
 Option 2: But he wasn't sure if he should.
Output (English): Option 2