Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The word "popularize" is classified as a verb because it describes an action or a process. In linguistic terms, verbs are words that express an activity, occurrence, or state of being. "Popularize" specifically refers to the act of making something well-known or widely accepted among a large group of people. For example, when an author or a celebrity promotes a particular idea, trend, or product to the public, they are engaging in the act of popularization.

To provide further clarity, we can look at the structure of the word: "popularize" is derived from the root "popular," which is an adjective that describes something that is liked or enjoyed by many people. The addition of the suffix "-ize" transforms the adjective into a verb, which indicates the action of causing something to become popular.

In contrast, the other options—adjective, noun, and adverb—do not apply here. An adjective describes a noun, a noun represents a person, place, thing, or idea, and an adverb modifies a verb, adjective or other adverb. Given this analysis, it's clear that "popularize" is best identified as a verb, thus confirming option B as the correct answer.