This decline in sensitivity to a constant stimulus that Sanjay has experienced is called sensory adaptation, as further explained below.
Imagine you come home and your mother is cooking. As soon as you enter the house, you can smell the garlic she is using to make the dish. However, after being home for some time, you can no longer notice the smell. This process is called sensory adaptation, and it means that your sensory receptors have gotten used to the stimulus (garlic smell) after being constantly exposed to it.
That is also the case with Sanjay. His sensory receptors are slowly getting used to the temperature of the water. That is why he no longer feels uncomfortable in the cold water.
With the information above in mind, we can choose "sensory adaptation" as the answer for this question.
Learn more about sensory adaptation here:
https://brainly.com/question/12993657
#SPJ12