The Justice Party, formed in 1916, was a political party in British India that aimed to represent the interests of the non-Brahmins. It was primarily supported by the wealthier landowning and urban middle-class non-Brahmins.

Option 1 is correct. The Justice Party indeed demanded separate communal representation for the non-Brahmins, similar to what the Muslims had been granted under the Morley-Minto Reforms. They believed that this would empower the non-Brahmins and provide them with a fair share in the political process.

Option 2 is correct. The Justice Party had the support of the richer landowning and urban middle-class non-Brahmins. They were seen as representing the interests of this section of society and worked towards their betterment.

Option 3 is correct. The Justice Party was successful in securing 28 reserved seats for the non-Brahmins in the Montagu-Chelmsford Reforms. This allowed for a greater representation of non-Brahmins in the legislative councils.

Option 4 is incorrect. The Justice Party did not support the call given by the Congress to boycott elections in 1920. They believed in participating in the electoral process and advocating for their demands through political representation.

In conclusion, the correct