Arrange the following parties in the Chronological order of their formation:

a- Bhartiya Jana Sangh
b- Congress Socialist Party
c- Indian National Congress
d- Bhartiya Janata Party

c-b-a-d

The correct answer is Option 4:  c-b-a-d

c- Indian National Congress -1885
b- Congress Socialist Party - 1934
a- Bhartiya Jana Sangh -1951
d- Bhartiya Janata Party  1980

The Indian National Congress was formed in the year 1885 by A.O. Hume.

The Congress Socialist Party was formed in 1934 with Acharya Narendra Dev as the founding President of Congress Socialist Party.

The Bharatiya Jana Sangh was formed in 1951 with Shyama Prasad Mukherjee as its founder-President.

Bhartiya Janata Party was formed in the year 1980 owing its lineage to RSS and Bharatiya Jana Sangh.