Miller Et Al

Miller et al. gave subjects a pretest before conducting Study 1 in their research on the relative effects of attribution versus persuasion in producing behavioral change. The importance of conducting this pretest was:

A) to get the children prepared for the increased number of tests, drills, and assignments that the experiment would involve.
B) to introduce the students to the experimenters.
C) to discover existing differences among the classrooms in how much they littered.
D) to discover how knowledgeable the children in each classroom were regarding issues of ecology and pollution.