Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: গ ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2013
Topic: Sentence (বাক্য), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The word "debt" is categorized as a noun because it refers to a specific concept: an obligation or liability that one party owes to another, typically in the context of money or financial responsibility. Nouns are words that represent people, places, things, or ideas, and "debt" fits perfectly into this category as it signifies a tangible concept created by a transaction or agreement.

To further illustrate, nouns can often be preceded by articles (e.g., "a debt" or "the debt"), which is a common grammatical structure used in English. In contrast, pronouns (like "he," "she," or "they") replace nouns; adverbs modify verbs, adjectives, or other adverbs by providing additional information about manner, time, place, or degree; and verbs express actions or states of being.

In summary, "debt" embodies the essential characteristics of a noun, representing a defined entity in financial discussions, which is why option A) Noun is the correct answer when identifying its grammatical classification.