A researcher is conducting an experiment on two predictors of conformity: group size and the presence of a defector (absent, present). The participants are randomly assigned to different group sizes, one composed of 3 participants and one composed of 8 participants, and then participate in absent and present defector conditions. This is an example of a(n):
A. within-subjects factorial design. B. within-subjects factorial design with an experimentally manipulated variable. C. between-subjects factorial design with a within-subjects variable. D. mixed-factorial design.