Topic: Adjective (বিশেষণ),

Best Answer Explained in Below-:

The word "contemporaneous" is classified as an adjective because it describes a quality or characteristic of a noun. Specifically, "contemporaneous" refers to things that exist or occur at the same time; for instance, when discussing historical events, we might refer to two societies that were contemporaneous with each other.

In English, adjectives modify nouns to provide more detail about them—indicating their attributes, qualities, or states. For example, in the phrase "contemporaneous civilizations," the term "contemporaneous" modifies the noun "civilizations" by specifying that they existed during the same period.

Understanding the function of the word helps distinguish it from other parts of speech. For instance, verbs express actions or states, nouns identify people, places, or things, and adverbs modify verbs, adjectives, or other adverbs. Since "contemporaneous" fulfills the role of providing descriptive information about nouns, it is correctly identified as an adjective (D).