The correct option is D petulance
The term "amiability" means being friendly and pleasant-mannered. Petulance means being childishly sulky or ill-tempered . Friendliness and ill-temper are opposite traits. Hence, Option D is correct. Among the rest of the options, pessimism means a tendency to see the worst aspect of things or believe that the worst will happen, prudence means cautiousness, sincerity means the absence of pretence, deceit, or hypocrisy. These options do not express this antonym, hence incorrect.