Diana\textgreater Mark, so it is not Diana.  William \textless{} Jimmy, so it is not Jimmy.  We already know that Mark did not have the smallest number of books.  So, it is William. 
When William, Mark, Diana, and Jimmy checked their book bags, they found that Mark\textquotesingle s books were fewer than Diana\textquotesingle s and Jimmy\textquotesingle s were more than William\textquotesingle s. Mark\textquotesingle s is not the least. Do you know who has the least books? (adapted from 2009 Math Kangaroo Problems, Level 1-2, Question \#21) 
Options:
A: William 
B: Mark 
C: Diana 
D: Jimmy 