Explanation:

Only statements 2&3 are correct.

Who decides on creating or scrapping districts, or changing their boundaries?

• This power lies with the state governments, who can pass a law in the Assembly or simply issue an order and notify it in the gazette. 
• The central government does play a role, however, when a change of name of a district or railway station is contemplated. The request of the state government in this regard is sent to several central government departments before a no-objection certificate is issued.
• Uttar Pradesh has the most districts (75) in the country, followed by Madhya Pradesh (52).

Hence option 4th is correct.