Explanation:

• The colonial government of British India was trying to suppress revolt in the ranks of the Royal Indian Navy in various cities, as inferred from the following report: Report to the Home Department in 1946: Bombay: Arrangements have been made for the Army to take over ships and establishments.
• Royal Navy ships are remaining outside the harbour. Hence, 1. Bombay is correct. Karachi: 301 mutineers are under arrest and a few more strongly suspected are to be arrested. All establishments are under military guard. Hence, 3. Karachi is correct. Vizagapatnam: The position is completely under control and no violence has occurred.
• Military guards have been placed on ships and establishments. No further trouble is expected except that a few men may refuse to work. Hence, 2. Vizagapatnam is correct. Director of Intelligence, HQ. India Command, Situation Report No. 7. File No. 5/21/46 Home (Political), Government of India.
• A failed uprising by Indian naval ratings, soldiers, police officers, and civilians against the British government in India was known as the Royal Indian Navy Mutiny or Revolt, also known as the 1946 Naval Uprising. From the initial flashpoint in Bombay (now Mumbai), the revolt spread and found support throughout British India, from Karachi to Calcutta (now Kolkata), and ultimately came to involve over 20,000 sailors in 78 ships and shore establishments.