Choose the most appropriate option to complete the given sentence:-

The train is expected to arrive _____ time, so make sure to be ready.

on

The correct answer is Option (2) → on

The prepositional phrase "on time" means at the scheduled time; punctually.

• On time: Punctual; at the exact planned time (e.g., The meeting started on time).

• In time: Means early enough; with enough time to spare (e.g., We arrived in time to catch the train).

Since the sentence refers to the train meeting its schedule, "on time" is the correct idiom.