Correct Answer: PROMPT

Solution : The correct choice is the fourth option.

Tardy means to move slowly or sluggishly. Prompt means "immediate" or "done without delay", which makes it an antonym for "tardy".

The meanings of the other options are as follows:

• Belated means happening later than should have been the case.
• Overdue means not having arrived.
• Delinquent means tending to commit a crime.