Topic: Degree of Comparison,

Best Answer Explained in Below-:

The phrase "The sum is very..... easier" requires the correct adverb to modify the comparative adjective "easier." The options provided are: A) very, B) more, C) much, and D) the most easier.

Option A, "very," cannot be used since it doesn't appropriately modify comparative forms. Adjectives in comparative form, like "easier," already imply a comparison, and "very" is typically used with positive forms (e.g., "very easy").

Option B, "more," is also incorrect because "easier" is already a comparative form, and "more" should not precede it.

Option C, "much," is the correct choice. "Much easier" is a commonly accepted expression that emphasizes the degree of ease. It effectively strengthens the comparative sense of "easier," indicating a significant improvement in the level of ease.

Option D, "the most easier," is grammatically incorrect because it incorrectly combines superlative ("the most") with a comparative ("easier"), creating redundancy.

Therefore, the most fitting expression is "The sum is much easier," making C the correct answer.