Person who claims to have great love for and understanding of what is beautiful in nature, art etc

Answer: Option B

One word substitute is Aesthete.

Critic: a person who expresses an unfavourable opinion of something.
Aesthete: a person who is appreciative of and sensitive to art and beauty.
Connoisseur: an expert judge in matters of taste.
Artist: a person who creates paintings or drawings as a profession or hobby.