Which of the following is NOT a possible combination of values of the variables in this program when it finishes running?

A. tails has a value of O and heads has a value of 100
B. tails has a value of 100 and heads has a value of O
C. tails has a value of 20 and heads has a value of 20
D. tails has a value of 50 and heads has a value of 50