Post-independence, which of the following Indian state acceded to the Indian Union by means of a plebiscite?

Junagarh

The correct answer is Option 1- Junagarh

The issue of Junagarh was resolved after a plebiscite confirmed people’s desire to join India.

JUNAGARH's accession with India:

The princely state of Junagadh initially declared its intention to remain independent after India's independence in 1947.
The Nawab acceded to Pakistan, despite the Hindu majority, which was strongly opposed by the Indian government.
A plebiscite was conducted, and the majority of Junagarh's population voted in favour of joining India.
The Government of India accepted the accession of Junagadh & Junagadh officially became a part of India on February 20, 1948.