The cafeteria staff made sandwiches. Each sandwich had either rye or white bread, Either ham or turkey, and either cheese or no cheese. The staff made an equal number of each type of sandwich. The sandwiches were placed on a tray. Without looking Mary will choose a sandwich. What are the chances that Mary will get a sandwich with cheese

A) 1/8

B) 1/6

C) 1/3

D) 1/2