The Princely State whose territories were merged into India after a ‘Plebiscite’ was :
(1) Kashmir
(2) Manipur
(3) Junagadh
(4) Hyderabad

3

The correct answer is Option 3 - 3 (Junagadh)

A plebiscite was held on 20 February 1948 in Junagadh and most of Junagadh's population voted to join India, after which it became a part of India.
The Government of India accepted the accession of Junagadh & Junagadh officially became a part of India on February 20, 1948.