​Which one of the following is a part of the American constitutional practice ?​

Correct option is D

All three practices mentioned—filibuster, senatorial courtesy, and pocket veto—are significant features of American constitutional practice, although they vary in terms of formal recognition in the Constitution.

Information Booster :

1. Filibuster
Definition: A parliamentary tactic used in the U.S. Senate to delay or block legislative action by extending debate.

Constitutional Status: Not mentioned in the U.S. Constitution, but firmly established as a Senate procedural rule.

Famous Usage: Extensively used in debates on civil rights legislation and judicial nominations.

2. Senatorial Courtesy
Definition: An unwritten custom whereby the U.S. Senate will not confirm a presidential appointment (especially judges) if the senator from the appointee’s state objects.

Constitutional Status: Not in the Constitution, but a long-standing customary practice that influences appointment confirmations.

3. Pocket Veto
Definition: A situation where the President does not sign a bill within 10 days (excluding Sundays) and Congress adjourns in the meantime. The bill does not become law.

Constitutional Basis: Article I, Section 7 of the U.S. Constitution provides for this veto power.