One day, Pip asks his parents: "What day is it today?"  His mother says: "Today is Monday."  His father says: "Today is Tuesday."  From the options below, \textbf{Pip agrees with B}. Do you agree with Pip? 
选项为:A:One of these two sentences is definitely wrong and the other one is correct.  B:It is possible that both of Pip\textquotesingle s parents are wrong.  C:It is possible that both of Pip\textquotesingle s parents are right.  D:If Pip\textquotesingle s mother is wrong, then his father must be right.  请回答其中一个选项.