Which Variable(s) Is (Are) Controlled, or Held Constant, in Each

Multiple Choice

Which variable(s) is (are) controlled, or held constant, in each partial table of Table 1?
Table 1. Percentage of Respondents Expressing High Tolerance of Civil Liberties for Political
Dissidents, by Gender and Religiosity

A) gender
B) religiosity
C) gender and religiosity
D) tolerance of civil liberties for political dissidents