When carlos first arrives at his friend's party, the music is so loud that he covers his ears. after a few hours, even though the music is still at the same volume, it stops bothering him. this change in his reaction to the volume of the music illustrates:
a) perceptual constancy.
b) sensory adaptation.
c) transduction.
d) saturation.
e) sensory adaptation

b) sensory adaptation.                                                                                              

Explanation:

Sensory adaptation: It refers to the process that signifies the change in the sensory receptor's sensitivity occurs concerning the stimulus relation. All senses that are present tend to experience sensory adaptation. The sensory adaptation reduces the tendency of a person's awareness towards a constant stimulus.

In the question above, the change in Carlos's reaction to the volume of the music illustrates the phenomenon of sensory adaptation.

b) trade is easy because of the direct line between their major ports. bilateral trade reached 89,6 thousand million.