As on March 2015, how many Prime Ministers of India have awarded the Bharat Ratna?

As on March 2015, how many Prime Ministers of India have been awarded the Bharat Ratna?
[A]Five
[B]Six
[C]Seven
[D]Nine

Seven
So far Seven Prime Ministers of India have been awarded the Bharat Ratna. Atal Bihari Vajapayee is the seventh Prime Minister to receive the award, after (1) Jawaharlal Nehru, (2) Indira Gandhi, (3) Rajiv Gandhi, (4) Morarji Desai, (5) Lal Bahadur Shastri and (6) Gulzarilal Nanda.