Concept:The sentence requires a superlative form because the speaker is expressing a preference among all sports.Explanation:The blank comes after "like" and before "is swimming".We need a word that means "to the greatest extent"."Better" and "more" are comparative forms and usually need "than"."Much" cannot connect naturally in this structure."Most" is the superlative degree of "much" and fits perfectly here.Therefore, the completed sentence is: "The sport I like most is swimming."Answer:C. most