Capricious (unpredictable/changeable) is the opposite of constant (stable). Similarly, whimsical (impulsive/unpredictable) contrasts with determined (firm/resolute). Option A shows the correct antonym relationship. Option B 'vicarious:reality' are not antonyms. Option C 'egotistic:altruistic' are antonyms but 'egocentric' would be the exact opposite of altruistic, not egotistic. Option D shows synonyms.