Albie is comparing the ratio of students in her class that are wearing the color green to the total number of students in her class. She finds out of 30 students in her class, 7 are wearing green. What kind of ratio relationship is she using?
A. part-to-part relationship
B. part-to-whole relationship
C. whole relationship
D. part relationship
Albie is comparing the ratio of students wearing the color green to the total number of students in her class. In this case, she is comparing a part (students wearing green) to the whole (total number of students). Therefore, the kind of ratio relationship Albie is using is a part-to-whole relationship. So, the correct answer is B. part-to-whole relationship.
