Arrange the following socio-economic and political developments in the Middle Gangetic Plains during the 1st millennium BCE in their correct chronological order (from earliest to latest): 1. Introduction of wet-paddy transplantation (Ropa) leading to demographic expansion. 2. Systematic introduction of Punch-Marked Coins (Ahata coins) facilitating long-distance trade. 3. Emergence of fortified urban centers (Mahanagaras) like Rajagriha and Champa. 4. Composition of early Upanishads questioning the efficacy of Vedic rituals. Choose the correct option:

Options:

• A: 1-4-3-2
• B: 4-1-3-2
• C: 1-4-2-3
• D: 4-1-2-3

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