Suppose Tamara's Favorite Arcade Game,PAC-MAN,costs $1 to Play and Her

Multiple Choice

Suppose Tamara's favorite arcade game,PAC-MAN,costs $1 to play and her second-favorite arcade game,Street Fighter,costs 50 cents to play.If she receives 10 utils when she plays Street Fighter,what is the least number of utils she must receive from PAC-MAN to play PAC-MAN over Street Fighter?

A) 15
B) 10
C) 25
D) 5
E) 20