Which of the following statements uses the idiom correctly?
i) For a very long time some of the provisions of the criminal code have remained a dead letter.
ii) Many new schemes to benefit the poor and the marginalized are announced during election campaigns, but many of them remain a dead letter in implementation.
iii) The opening of the newest facility in airports was a dead letter day for the flyers.

Correct option is C

Option (c) is the correct answer.
Explanation:
· Meaning of 'a dead letter': A law, rule, or custom that is no longer enforced or observed (कानून या नियम जो लागू नहीं रहा).
· Statement i) correctly mentions criminal code provisions being a dead letter.
· Statement ii) correctly states schemes becoming ineffective after elections.
· Statement iii) is wrong because "dead letter" is not used for events or days.
Example:
The old smoking ban has become a dead letter.
Other Related Idioms:
· Throw in the towel – To give up.
· Beat around the bush – To avoid the main topic.