The Chi Square Test Candace Studies Factors Related to Students

The Chi Square Test Candace studies factors related to students dropping out of school.She constructs a 2 X 2 contingency table (Drinking alcohol: under 5 drinks a week, over 5 drinks a week X Study time: under 15 hours a week, over 15 hours a week) .How many degrees of freedom are required by a chi square test of these data?

A) 1
B) 2
C) 3
D) 4