No national productivity measures are available for underground industries that may exist but remain unreported. On the other hand, at least some industries that are run entirely by self - employed industrialists are included in national productivity measures. From the information given above, it can be validly concluded that
No national productivity measures are available for underground industries that may exist but remain unreported.
Underground industries: No national productivity measures
At least some industries that are run entirely by self - employed industrialists are included in national productivity measures.
Some self - employed industrialists industries: national productivity measures
Only Option D is correct.
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