Concept:In a parliamentary system, the Chief Whip is the party official responsible for enforcing party discipline among members during sittings.
Explanation:The Chief Whip ensures that members of the party attend parliament and vote according to the party leadership’s direction.
He or she administers the whipping system, which helps maintain unity and discipline within the party.
While the majority leader and minority leader handle legislative floor business, they do not primarily enforce internal party discipline.
The clerk of the House is a procedural officer and has no role in party discipline.
Therefore, the officer who enforces discipline among members of his party in parliament is the Chief Whip.
Answer:D. chief whip