Final answer:
The word 'perfunctory' is synonymous with 'disinterested', indicating an action done without genuine interest or effort.
Step-by-step explanation:
The word that means the same as perfunctory is b) Disinterested. Perfunctory describes a manner of doing something that is done without real interest, feeling, or effort - essentially, it is carried out with a sense of disinterest or lack of enthusiasm. In contrast, curious implies a strong desire to know or learn something, quiet means making little or no noise, and sympathetic denotes feelings of pity and sorrow for someone else's misfortune.