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) 
选项为:A:William  B:Mark  C:Diana  D:Jimmy  请回答其中一个选项.