State emergency can be proclaimed in a state when

• A.  The President holds the view that the state(s) has/have failed to comply with the directions of the Union and that it is lawful to take over the administration of the state owing to the failure to the Constitutional machinery
• B.  The President uses his discretionary powers.
• C.  The Union Council of Ministers advises the President in a written communication.
• D.  A part of India is in the grip of armed rebellion