According to the chapter They Don't Look the Same to Meabout homogeneity and heterogeneity biases,

why did participants watch a film clip of various landscapes for 5 minutes after viewing the initial 16
faces?

(a) to help participants encode the faces into long-term memory
(b) to test participants' memory for stimuli other than faces
(c) to increase the cognitive load on participants
(d) to prevent participants from rehearsing the faces in their minds during the delay between the first and second groups of faces

D