Bhartiya Janata Party is rebirth of which of the following political party?

Bhartiya Jana Sangh

the Bharatiya Jana Sangh had merged into the Janata Party. After the fall of the Janata Party and its break-up, the supporters of erstwhile Jana Sangh formed the Bharatiya Janata Party ( BJP) in 1980. Initially, the BJP adopted a broader political platform than that of the Jana Sangh. It embraced ‘Gandhian Socialism’ as its ideology. But it did not get much success in the elections held in 1980 and 1984. After 1986, the party began to emphasise the Hindu nationalist element in its ideology. The BJP pursued the politics of ‘Hindutva’ and adopted the strategy of mobilising the Hindus.