Topic: Adjective (বিশেষণ),

Best Answer Explained in Below-:

To understand why "comprehensive" is the correct answer, we need to look at the definitions and grammatical roles of the given options. An adjective is a word that describes or modifies a noun.

1. **Comprehensive (A)**: This option is indeed an adjective. It means "thorough" or "complete," often used to describe something that covers a wide scope or includes all or nearly all elements. For example, a "comprehensive report" includes all pertinent details regarding a subject.

2. **Comprehend (B)**: This word is a verb, meaning "to understand." It is not used to modify nouns but instead describes an action.

3. **Comprehension (C)**: This is a noun that refers to the act or ability to understand something. While it relates to understanding, it does not serve to modify a noun.

4. **Comprehensively (D)**: This option is an adverb, which means "in a thorough or complete way." It describes how something is done but does not describe a noun directly.

In summary, "comprehensive" is the only word in the list that functions as an adjective, making it the correct answer to the question asking for an adjective.