The correct answer is option 2, "2 only". This means that statement 2 is not correct, while statement 1 is correct.

Statement 1 refers to the declaration made by the rebels during the rebellion of 1857, also known as the Indian Rebellion or the First War of Independence. The Azamgarh Proclamation was a declaration made by the rebels in the Azamgarh district of Uttar Pradesh, India. It expressed their grievances against British rule and their determination to fight for independence.

Statement 2, however, is incorrect. There was no underground movement led by a single leader during the Revolt of 1942 that is specifically referred to as the Azamgarh Proclamation. The Azamgarh Proclamation is associated with the rebellion of 1857, not the Revolt of 1942.

Therefore, the correct answer is option 2, "2 only".