Read the following context and choose the best option to answer the question.
Context: I scrubbed my kitchen floor yesterday because one of them still does n't understand the concept of the litter box . Not sure which one yet . They all seem to think the food dish is a bed and toy as well , so I ' m thinking they 're all using the food dish as a one stop restaurant , potty and inn . I think I ' m getting Elizabeth into dance class next week .
Question: What may be the reason for their complaint ?
Options: 
A. Their cat keeps ignoring the litter box .
B. None of the above choices .
C. Their daughter is leaving a mess in the house .
D. All of their cats ignore the litter box .


A