| Party | Its Leader |
|---|---|
| 1. Bharatiya Jana Sangh | Dr. Shyama Prasad Mukherjee |
| 2. Socialist Party | C. Rajagopalachari |
| 3. Congress for Democracy | Jagjivan Ram |
| 4. Swatantra Party | Acharya Narendra Dev |
Based on the analysis, only two pairs (1 and 3) are correctly matched. Therefore, options stating 'Only one', 'Only three', or 'All four' are incorrect.