Topic: Adverb (ক্রিয়াবিশেষণ),

Best Answer Explained in Below-:

In the sentence "Rahim always runs quite fast," the word "always" functions as an adverb. To understand why it is classified as such, we must first define what an adverb does. Adverbs modify verbs, adjectives, or other adverbs by providing additional information about the manner, time, frequency, or degree of the action or quality described.

In this case, "always" specifies the frequency with which Rahim runs—indicating that he runs at all times or on every occasion. It answers the question "How often does Rahim run fast?" By adding this temporal context, "always" enhances our understanding of Rahim's running habits.

The other options do not fit the role of "always" in this context:
- A pronoun replaces a noun (e.g., he, she, it) and does not modify actions.
- A noun refers to a person, place, thing, or idea (e.g., speed, runner) and is not what "always" does.
- An adjective describes or modifies a noun (e.g., fast in "Rahim runs fast"), which is also not the role here.

Thus, the correct choice—C) Adverb—accurately identifies "always" as a modifier that describes the frequency of Rahim's running.