A psychologist discovers that moderate, but unpredictable, noise during a cognitively demanding task leads to a significant increase in negative evaluations of their partners by participants doing the task in cooperation with another student. Whether a similar level of unpredictable noise occurring in a college dormitory will have an adverse effect on students' evaluations of their roommates is

an issue of

a. sample generalization.
b. a density effect.
c. an interaction.
d. variable representativeness.

D