According to Berridge and Robinson (2016), the pleasurable aspects of drugs increase as a full-blown, severe substance use disorder is established. In other words, addictive substances are "liked" less. This is because the brain dopamine systems can be enduringly 'sensitized' over time. Which of the following is correct?

a. "liked" less should be changed to "liked" more.
b. increase should be changed to decrease.
c. 'sensitized' should be changed to 'shutting down'.
d. nothing should be changed; the above paragraph is entirely correct