Q: In this task, you need to provide the correct option for a given problem from the provided options.
Problem: in a class of 50 students , 20 play baseball , 15 play cricket and 11 play football . 7 play both baseball and cricket , 4 play cricket and football and 5 play baseball and football . if 18 students do not play any of these given sports , how many students play exactly two of these sports ?
Options: a ) 10 , b ) 46 , c ) 67 , d ) 68 , e ) 446
A:
a