An Experiment Was Conducted to Determine If Gender of the Teacher

An experiment was conducted to determine if gender of the teacher and the amount of eye contact by the teacher influenced students' liking of the teacher. Students were randomly assigned to groups that had either a male or female teacher who made little, moderate, or sustained eye contact while giving students a lecture on career choices. At the end of the lecture the students were asked to rate their liking of the teacher. This is a design potentially with _________ main effects.

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