Shelly has a bag containing three balls : one red, one yellow, and one green. All balls are likely to be chosen. Shelly will choose one ball without looking in the bag. What is the probability that Shelly will choose the yellow ball out of the bag?

A. 3/3

B. 3/1

C. 1/3

D. 2/3

C. She has three balls total

The answer is c. Since she has three balls and she is going to chose one is will be 1/3

Hope this helps