What were the reasons which led to the Battle of Plassey in 1757?

Reasons leading to the Battle of Plassey in 1757 were the Nawab of Bengal challenging the British activities such as:

1. Non-payment of taxes.
2. Levying of heavy duties on Indian goods entering Kolkata which was under their control.
3. Fortification of their factory.
4. Capturing the French settlement of Chandernagore in March 1757.