Explanation:

• Crossing the floor: Passing between the member addressing the House and the Chair which is considered a breach of Parliamentary etiquette. Hence option (a) is not correct. • Yielding the floor: The Speaker of the Lok sabha can ask a member of the house to stop speaking and let another member speak. Hence option (b) is the correct answer. • Interpellation: Question hour is also known as 'Interpellation' which means when you question someone formally, concerning an official action or policy or personal conduct. Hence option (c) is not correct. • Point of Order: A Member of Parliament may raise a point of order if he feels that the proceedings of the House do not follow the normal rules. The presiding officer decides whether the point of order raised by the member should be allowed. Hence option (d) is not correct.