A Researcher Wants to Know If an Experimental "Smoke Out

A researcher wants to know if an experimental "Smoke Out" class for girls compared to aregular girls' health class at another school will significantly decrease smoking in highschool students. She also wants to know whether student grade level (9-12) makes adifference. Match accordingly. (You may use each letter choice more than once.)
-Attribute independent variable(s) :

A) High school students
B) Amount of smoking
C) Grade in school
D) Attribute independent variable(s)
E) Extraneous variable
F) Type of class
G) Dependent variable
H) Active independent variable(s)
I) Female students
J) Location of the school