How many members are nominated by the President of India in the Rajya Sabha?

The correct answer is (a) 12.

The President of India nominates 12 members to the Rajya Sabha. These members are chosen from among persons who have special knowledge or practical experience in literature, science, art, social service, industry, commerce, agriculture, law, education, medicine, or public affairs.

The other options are incorrect because they do not represent the correct number of members nominated by the President of India to the Rajya Sabha.