Gerard is making some chicken soup. His roommate tastes it and tells Gerard it is perfect, but Gerard thinks it needs more salt. He adds just a little salt and thinks that now it tastes fine. However, his roommate tastes it again and tells Gerard that now it is ruined because it has too much salt. Based on research conducted by psychophysicists you should conclude that compared to his roommate,

Gerard has:

a. a lower absolute threshold for the taste of salt
b. a lower perceptual invariance for the taste of salt
c. a higher difference threshold for the taste of salt
d. a higher absolute threshold for the taste of salt

C