The correct answer is option 1: Maharaja Hari Singh`s signing of Instrument of Accession. On the 26th of October, 1947, Maharaja Hari Singh, the ruler of the princely state of Jammu and Kashmir, signed the Instrument of Accession. This document officially declared the accession of Jammu and Kashmir to the Dominion of India.

The signing of the Instrument of Accession was a significant event in Indian history because it led to the integration of Jammu and Kashmir into the Indian Union. Prior to this, Jammu and Kashmir had been a princely state, meaning it was ruled by a hereditary ruler (in this case, Maharaja Hari Singh) rather than being directly governed by British India.

The signing of the Instrument of Accession came during a time of turmoil in the region, following the partition of India and the creation of Pakistan. There were tensions between India and Pakistan over the control of princely states, including Jammu and Kashmir. With the signing of the Instrument of Accession, Jammu and Kashmir became a part of India, although the issue of its ownership and control remains a contentious topic between India and Pakistan to this day.

It should be noted that the other options provided – ceasefire with Pakistan, merger of Sind,