**The reasoning**
A word that **describes** a noun is called an **adjective**. This is a core grammar principle: adjectives modify (give more information about) nouns.
Think of it this way:
- Noun = person, place, thing, or idea (e.g., "student," "Lagos," "book")
- Adjective = word that tells you *what kind*, *which one*, or *how many* (e.g., "brilliant student," "busy Lagos," "thick book")
The adjective answers: What is the noun like? "Beautiful girl," "tall building," "three mangoes" — *beautiful*, *tall*, and *three* are all adjectives describing the nouns.
**Why the wrong options tempt you**
- **Verb (A)**: Shows action or state of being ("run," "is"). Students confuse this because verbs also relate to nouns, but they don't *describe* them.
- **Adverb (B)**: Describes verbs, adjectives, or other adverbs ("quickly," "very"). The "ad-" prefix tricks you, but adverbs modify actions, not nouns.
- **Preposition (D)**: Shows relationship/position ("in," "on," "beside"). Totally different function.
**Quick takeaway**
Adjectives are the **"paint"** that colors your nouns — they tell you what the noun looks like, feels like, or how many there are.