=+1. Tonya's psychology teacher played some backwards mu- sic to the class, and they were not able to make out any words or phrases in the selection. When the teacher told them to listen for the words "The rat ate the cat" when she played it again, most of the class now heard the words. Which principle explains this experience?

a. A context effect

b. Perceptual set

c. Extrasensory perception

d. Selective attention

e. Weber's law