Concept:Words that describe or modify a noun are called adjectives.
Explanation:The sentence is: “Amar ensured the timely delivery of the products.”
Here, the word “timely” appears just before the noun “delivery.”
It tells us what kind of delivery it was, meaning a prompt or on-time delivery.
Since “timely” modifies the noun “delivery,” it acts as an adjective.
It is not an adverb because it does not describe a verb, adjective, or another adverb.
It is also not a noun or a preposition.
Therefore, the correct word class is Adjective.
Answer:Option B — Adjective.