The correct answer is option 2 - 1, 2 and 3 are correct.

Explanation:

1. Governor-General Warren Hastings did face the persistent Sanyasi and Faqir disturbances in Bengal and Bihar. This is because the Sanyasis and Faqirs were causing disruptions and rebellions in these regions during his rule.

2. There were indeed a number of Shaivite Naga Sanyasis who formed into armed bands. The Naga Sanyasis were a sect of Hindu ascetics who worshiped Lord Shiva and were known for their martial skills. They formed into armed bands and became involved in various disturbances and rebellions.

3. Majnu Shah was indeed a prominent leader who led bands into Bengal from 1771. He was a Sufi faqir who advocated for a more egalitarian society and preached against social injustices. He gathered a following and led them in their rebellions against the British rule.

Therefore, option 2 is the correct answer as all three statements are correct. It is important to understand the role of the Sanyasi and Faqir disturbances in creating challenges for the colonial administration during this period.