Which of the following probabilities for the sample points $A,B,$ and $C$ could be true if $A,B,$ and $C$ are the only sample points in an experiment?

A$.P(A)=-\frac{1}{4},P(B)=\frac{1}{2},P(C)=\frac{3}{4}$

B$.P(A)=\frac{1}{8},P(B)=\frac{1}{3},P(C)=\frac{1}{6}$

C$.P(A)=\frac{1}{10},P(B)=\frac{1}{10},P(C)=\frac{1}{10}$

D$.P(A)=0,P(B)=\frac{1}{7},P(C)=\frac{6}{7}$