Mr. Billings conducted an experiment with bag of marbles. Mr. Billings did not tell his students what color of marbles were in the bag. Mr. Billings had 30 students choose a marble at random from the bag, record its color and then replace it in the bag. The results of the experiment are presented in the table: What is sample space as shown in the table?

A) S = 30 marbles

B) S = 12/30

C) S= {blue, green, red, yellow}

D) Can not be determined since we do not know what colors are in the bag.