Step 1: Understanding prepositions of time.
Prepositions like “at,” “on,” and “in” are used to show time. “At” is used for specific times of the day, such as 3 p.m., 10 a.m., midnight, etc.
Step 2: Analyze the options.
- (a) over: Used for duration or covering a period (e.g., over the weekend) — incorrect.
- (b) to: Used for direction or movement — incorrect here.
- (c) at: Used for a specific time — correct.
- (d) for: Used for duration (e.g., for two hours) — incorrect.
Step 3: Constructing the correct sentence.
The correct sentence is: “The train leaves at 3 p.m.”
Step 4: Conclusion.
Therefore, the correct preposition is “at.”