Mariel kept track of the color of shirts that customers bought at her store today. The following were her results at the end of the day. Red: 7 Blue: 8
Green: 5
Black: 10
Tomorrow, Mariel is going to give away a shirt to a random customer. Based on the information from today, which of the following is true?

A The person is as likely to choose either a red shirt or a blue shirt.
B The person is two times more likely to choose a green shirt than a black shirt.
C The person is more likely to choose a red shirt than a black shirt.
D The person is two times more likely to choose a black shirt than a green shirt.