Answer: Option D
Answer: (d)
Preventive detention is an imprisonment that is putatively justified for non-punitive purposes. In contrast to this, under preventive detention, the government can imprison a person for some time without a criminal charge.
It means that if the government feels that a person being at liberty can be a threat to the law and order or the unity and integrity of the nation, it can detain or arrest that person to prevent him from doing this possible harm