Task: Wrong Candidate Generation
Input (English): Context: Also , on Thursday , because I was not feeling well , I did n't run . I caught up on Sunday ( though not with running , but by moving furniture and boxes up and down two flights of stairs continuously for 3 hours . I was too exhausted to move afterwards , let alone run !. 
Question: What may be the reason for using the stairs ? 
Correct Answer: None of the above choices .
Output (English): They did nt know how to use the elevator .