Correct Option (B)
The statement explicitly links the "conceptual difficulties in National Income comparisons between underdeveloped and industrialised countries" to the fact that "a part of the national output in various underdeveloped countries is produced without passing through the commercial channels." This directly implies that the existence of a non-commercialized sector in these economies complicates the accurate comparison of national income across different countries, as such output may not be fully captured in official economic statistics.
Incorrect Options:
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Option (A) is not implied. The statement focuses on the issue in underdeveloped countries and does not assert that the entirety of national output in industrialized countries invariably passes through commercial channels. It highlights a significant difference in the proportion of non-commercialized output between the two types of economies.
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Option (C) is not implied. The statement describes a practical challenge in economic measurement; it does not advocate for a policy that all national output must pass through commercial channels. It is an observation regarding measurement difficulty, not a normative prescription.
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Option (D) is not implied. While a substantial non-commercialized sector is often observed in underdeveloped economies, the statement presents this phenomenon as a reason for difficulty in national income comparison, rather than defining it as an inherent sign of underdevelopment itself. The emphasis is on the methodological challenge.