Let's match the terms with their correct descriptions:
(A) Varna system - The Varna system refers to the four-fold division of society in Hinduism. This division categorizes people into Brahmins, Kshatriyas, Vaishyas, and Shudras. Thus, (A) - (II) is correct.
(B) Scheduled Castes - Scheduled Castes were officially recognized by the Government of India Act, 1935 to provide certain affirmative actions to improve their social and economic conditions. Thus, (B) - (IV) is correct.
(C) Sanskritisation - Sanskritisation is the process by which lower castes or tribes adopt the higher caste practices, including rituals and customs, in an effort to improve their social status. Thus, (C) - (I) is correct.
(D) Resistance Tribes - Resistance Tribes are those who are often opposed to Hindu society and resist the imposition of the caste system and other social norms. Thus, (D) - (III) is correct.
Therefore, the correct answer is Option 2: (A) - (II), (B) - (IV), (C) - (I), (D) - (III).