The correct option is A Aesthete
Option A, Aesthete is a 'person who claims to have great love for and understanding of what is beautiful in nature, art etc'. Option A 'Critic' is a person who judges the merits of artistic works, professionally. Option C 'Connoisseur' is a person who has expert knowledge of food, drinks and can judge its quality. Option D 'Artist' is a person who paints or draws as a profession or hobby. Thus, options A, C and D are incorrect and the correct word for the phrase is Option B, Aesthete.