The correct option is B Chairman of Rajya Sabha
The Constitution of India specifically prescribes the function of the presiding officer of the Rajya Sabha. As the Chairman of the Rajya Sabha, the Vice- President presides over the meeting of the House. He is also the principal spokesman of the House and represents the collective voice to the outside world. Article 63 of the Constitution provides the Vice-President to be the ex-officio chairman of Rajya Sabha.