Which form of adjective is used to compare things?

The choice of a comparative adjective is correct because comparative adjectives are specifically used to make comparisons between two entities. They often involve adding the suffix "-er" to the base form of an adjective or using the word "more" in front of longer adjectives. For example, in comparing two houses, one might say "this house is larger than that one," where "larger" functions as the comparative adjective to highlight the difference in size.

Superlative adjectives, on the other hand, are used when comparing three or more entities, indicating the highest degree of a quality (e.g., "largest," "fastest"). Descriptive adjectives simply provide information about a noun without making direct comparisons, such as saying "the red car." Quantitative adjectives indicate quantity but do not serve a comparative function, such as “three apples” or “many problems,” which also do not involve comparison. Thus, the comparative adjective is the form that specifically addresses comparisons between two things.