"Alleviate" means to make something more bearable or less severe, while "Aggravate" means to make something worse or more intense. Therefore, option (C) Aggravate is the most suitable antonym in this context.

"Flabby" describes something that is soft, loose, or lacking firmness. Therefore, "Firm" is the opposite, indicating solidity or a lack of flabbiness.

"Difference" implies a degree of dissimilarity or distinction, and "Similarity" represents the opposite, indicating things that are alike or have common features. Therefore, option (A) Similarity is the most suitable antonym in this context.

The most appropriate antonym for the underlined word "blessed" in the given sentence is "cursed." "Blessed" implies being favored, protected, or endowed with divine grace, while "cursed" suggests being subjected to divine displeasure or misfortune. The other options— "appointed" (designated for a specific role), "produced" (created), and "applied" (put into action)— do not convey the opposite meaning of "blessed" in this context.