The Bharatiya Jana Sangh was an Indian nationalist political party. This party was established on 21 October 1951 in Delhi, that existed from 1951 to 1977. Its three founding members were Shyama Prasad Mukherjee, Balraj Madhok and Deendayal Upadhyaya. Hence pair 1 is correctly matched. C. Rajagopalachari was the founder of the Swatantra Party, not the Socialist Party. The Socialist Party was associated with leaders like Ram Manohar Lohia and Jayaprakash Narayan. Hence pair 2 is not correctly matched. The Congress for Democracy (CFD) was an Indian political party founded in 1977 by Jagjivan Ram. It was formed after Jagjivan Ram, Hemavati Nandan Bahuguna, and Nandini Satpathy left the Indian National Congress of Indira Gandhi and denounced her rule during the Indian Emergency. Hence pair 3 is correctly matched. The Swatantra Party was an Indian classical liberal political party that existed from 1959 to 1974. It was founded by C. Rajagopalachari in reaction to what he felt was the Jawaharlal Nehru-dominated Indian National Congress's increasingly socialist and statist outlook. Hence pair 4 is not correctly matched. Hence option (b) is the correct answer.