Correct option is D
The Speaker of the Lok Sabha presides over a joint sitting of both Houses of Parliament. A joint sitting is convened when there is a deadlock between the Lok Sabha and the Rajya Sabha regarding the passage of a bill (except for Money Bills and Constitutional Amendment Bills). As per Article 108 of the Constitution, if the two houses disagree, the President can summon a joint sitting, which is presided over by the Speaker of the Lok Sabha.