Topic: Degree of Comparison,

Best Answer Explained in Below-:

The question presents a sentence fragment, "Honey is--sweet," that requires an appropriate adverb to complete the thought. Each of the answer choices modifies the adjective "sweet" in different ways.

Option A, "very," is an adverb that intensifies the adjective it precedes, indicating a high degree of the quality described. By saying "Honey is very sweet," it conveys that honey possesses a significant level of sweetness, enhancing the statement's descriptive quality.

Options B ("too much") and C ("much too") suggest an excessiveness that is not appropriate in this context. "Too much" implies that the sweetness is overwhelming or undesirable, while "much too" carries a similar connotation but is less commonly used to describe taste in a neutral or positive context.

Option D, "extensive," is unsuitable as it typically relates to quantity or coverage rather than sweetness or taste; it fails to apply to the adjective "sweet" effectively.

Thus, option A, "very," is the best choice, as it correctly emphasizes the delightful nature of honey's sweetness.