Correct Option (2)
The passage explicitly states that rural roads, due to their sparse traffic, render tolling unviable. This lack of potential for monetary gains makes private sector investment in such infrastructure unprofitable. Consequently, the passage argues that these roads must be on the state's balance sheet, implying that the public sector is the sole viable entity for their development and maintenance under such conditions.
Incorrect Options:
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Option 1: The passage does not assert that rural development work is exclusively the domain of the government. It provides a specific economic rationale for public sector involvement in rural roads, rather than a general principle for all rural development.
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Option 3: While the government does utilize taxpayer funds, the passage's argument for public sector ownership of rural roads is specifically based on the unviability of private sector profit generation through tolls. It does not present a generalized principle that all responsibilities funded by taxpayers automatically fall solely to the government, especially when contrasted with situations where private sector involvement is viable.
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Option 4: The passage does not discuss the social responsibility of the private sector. Its reasoning for public sector involvement in rural roads is purely economic, focusing on the lack of profitability for private entities, not on the absence or presence of private sector social responsibility.