Mrs. McEnroe's sixth-grade class has 15 students, 9 of which are boys. Which of the following describes the ratio of boys to girls in Mrs. McEnroe's class? Group of answer choices

a. The ratio of boys to girls is 1:2 because there are 50% more boys than girls in the class.

b. The ratio of boys to girls is 3:5 because, for every 3 boys in the class, there are 5 girls.

c. The ratio of boys to girls is 3:2 because, for every 3 boys in the class, there are 2 girls.

d. The ratio of boys to girls is 60:1 because 60% of the students in the class are boys.