He is a person of no importance. Here `on importance' is a/an ____ phrase.

Explanation of all the options:

1.Adjective

• Explanation: While the phrase describes the noun person, making it adjectival in function, the phrase itself is not an adjective.
• Incorrect ❌

2.Noun

• Explanation: The phrase contains the noun "importance," but the entire phrase is not functioning as a noun in this sentence.
• Incorrect ❌

3.Adverb

• Explanation: Adverbial phrases modify verbs, adjectives, or other adverbs. Since this phrase describes the noun person, it is not functioning as an adverb.
• Incorrect ❌

4.Preposition

• Explanation: "Of" is a preposition, and the phrase "of no importance" is a prepositional phrase that modifies person by indicating possession or relation.
• Correct ✅