"The train departed late."

The correct answer is Option (2) → Adverb of Time

An adverb is a word that tells how, when, where or how much something happens. It can also describe an adjective or another adverb, for example she sings sweetly, very hot.

Here late means after the usual or expected time. It tells when the train departed.

Option	What it tells	Example
(1) Adverb of Reason	why something happens (therefore, hence)	The road was blocked and hence we took another way.
(2) Adverb of Time (answer)	answers the question when? (now, soon, early, late, today)	Our flight landed late because of the fog.
(3) Adverb of Place	where something happens	The children are playing outside.
(4) Adverb of Manner	how an action is done: “late” tells the time of leaving, not the way the train moved	The train moved slowly over the bridge.