Which of the Following Assignments of Probabilities to the Sample $P ( A ) = - \frac { 1 } { 4 } , P ( B ) = \frac { 1 } { 2 } , P ( C ) = \frac { 3 } { 4 }$

Multiple Choice

Which of the following assignments of probabilities to the sample points A, B, and C is valid if A, B, and C are the only sample points in the experiment?

A) $P ( A ) = - \frac { 1 } { 4 } , P ( B ) = \frac { 1 } { 2 } , P ( C ) = \frac { 3 } { 4 }$
B) $P ( A ) = \frac { 1 } { 5 } , P ( B ) = \frac { 1 } { 10 } , P ( C ) = \frac { 1 } { 2 }$
C) $P ( A ) = \frac { 1 } { 7 } , P ( B ) = \frac { 1 } { 7 } , P ( C ) = \frac { 1 } { 7 }$
D) $P ( A ) = 0 , P ( B ) = \frac { 1 } { 12 } , P ( C ) = \frac { 11 } { 12 }$