b$)$ What is the response variable in the$$ study? Is the response variable qualitative or$$ quantitative? What is the explanatory$$ variable?

What is the response variable in the$$ study? Is the response variable qualitative or$$ quantitative?

A$.$

The response variable is the body mass index of the adolescents. The response variable is quantitative.

B$.$

The response variable is the number of the adolescents who have a DVD player in their bedroom. The response variable is quantitative.

C$.$

The response variable is whether the adolescent has a DVD player in the bedroom or not. The response variable is qualitative.

D$.$

The response variable is the number of the adolescents who participate in the study. The response variable is quantitative.