Antonia and Bethany Played in the Same 50 Tennis Matches

Antonia and Bethany played in the same 50 tennis matches last year.Antonia made the finals in 20 of those matches.Bethany made the finals in 15 of the matches.In 12 of the matches, they both made the final.In what proportion of the matches did neither player make it to the final match?

A) .24
B) .82
C) .90
D) .88
E) .54