In Later Vedic texts, terms like 'Nishka', 'Satamana', and 'Krishnala' are frequently mentioned in economic transactions. What do these terms represent in the context of the material culture of that era?

Options:

• A: Different varieties of high-yielding rice cultivated in the fertile plains of Videha.
• B: Standardized metallic weights or units of value, serving as a precursor to metallic currency, though actual minted coins had not yet fully circulated.
• C: Specialized guilds of iron-smiths who held a monopoly over the production of agricultural tools.
• D: Land-revenue assessment categories based on the fertility of the soil.

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