Answer: A — National Statistical Office
The National Statistical Office (NSO), formerly known as NSSO, conducts surveys on employment and unemployment in India and provides the related data.
Source: Sectors of the Indian Economy, Chapter 2 — Notes for the Teacher (Sources for Information)
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The passage explicitly states that employment figures are based on data from surveys conducted by the National Sample Survey Organisation (NSSO), now known as National Statistical Office (NSO), under the Ministry of Statistics and Programme Implementation. This is the direct textbook reference examiners expect. The other options (NITI Aayog, NIC, Public Service Commission) have no role in providing employment data as per the chapter.