The word "comfort" means a state of physical ease, relaxation, or freedom from pain or constraint.
Its direct antonym is "discomfort," which means a state of slight pain, unease, or lack of comfort.
Option (A), "Uncomfort," is not a standard English word and is incorrect.
Option (B), "Miscomfort," is also not a recognized English word and does not exist in common usage.
Option (D), "None of these," is incorrect because a valid antonym is indeed present in the list — "discomfort."
Therefore, the correct answer is (C) Discomfort.