When researchers added a few drops of vinegar to a brand-name beer, the beer tasters disliked it only if they had been told they were drinking vinegar-laced beer. this best illustrates the impact
a. subliminal stimulation.
b. sensory adaptation.
c. perceptual set.
d. prosopagnosia.

C. perceptual set.                                            

Explanation:

Perceptual set: The term perceptual set, in psychology, is defined as a group of a person's expectations that form experience by making the person sensitive or responsive to the particular sort of information. The term perceptual set is also referred to as perceptual expectancy. It can occur in each kind of sense and is a susceptibility to discern things in a specific way.

In the question above, the statement given best illustrates the impact of the perceptual set.

answer; cattle ranching on the savanna,and forestry in the amazon;