Tai has a bag of different-colored balloons. Without looking in the bag, she selects a balloon, records its color, and puts it back in the bag. All balloons are equally likely to be chosen. She performs 50 trials.

Number of times a red balloon was chosen 15

Number of times a yellow balloon was chosen18

Number of times a green balloon was chosen9

Number of times a pink balloon was chosen8

Based on the data Tai collected, what is the estimated probability, in simplest form, of choosing a yellow balloon from the bag?

A. 9/50

B. 18/100

C. 9/25

D. 50/18​