which one of the following words phrases if the superlative form of an adjective?

A.Less
B.Slower
C.Most active
D.more rapidly

http://www.eflnet.com/tutorials/adjcompsup.php

more rapidly

To determine the superlative form of an adjective, we need to understand the rules for forming comparatives and superlatives.

Comparative forms are used to compare two things, while superlative forms are used to compare three or more things.

First, let's analyze the given options:

A. "Less" is used to compare two things, indicating a smaller quantity or degree. It is not a superlative form.

B. "Slower" is the comparative form of the adjective "slow." It is used to compare two things. Therefore, it is not the superlative form.

C. "Most active" is the superlative form of the adjective "active." It is used to compare three or more things. This is the correct answer.

D. "More rapidly" is the comparative form of the adjective "rapid." It is used to compare two things. Therefore, it is not the superlative form.

So, the correct answer is C. "Most active."