As the result of a genetic mutation, the individuals in a population of mice eat so much that their ...

As the result of a genetic mutation, the individuals in a population of mice eat so much that their
  stomachs burst. Which of the following statements provides the best explanation for why this
  happened?
  a. The mice were unable to taste the food and so they ate more than a normal amount.
  b. The mice were given a high protein meal and protein is not digested in the stomach.
  c. The mechanoreceptors of the stomach were either absent or not functioning.
  d. The animals were born without proprioceptors.
  e. The chemoreceptors did not detect the presence of food in the stomach.

Question 2

If the __________ of the stomach were damaged, one would be incapable of detecting the presence of
  food inside.
  a. mechanoreceptors
  b. proprioceptors
  c. thermoreceptors
  d. exteroceptors
  e. interoceptors