Football team needs to gain 10 yards to score touchdown. On the first play the team gained 7 yards. on the second play they were penalized and lost 5 yards on the. third play they gained 2 yards. how many more yards must they gain on the forth play in order to score?
 A. 2 yards 
 B. 4 yards 
 C. 6 yards 
 D. 8 yards 
 PLEASE HELP