This checks which body is responsible for calculating India's national income figures.
A (RBI): RBI handles monetary policy and banking, not the calculation of national income.
B (Central Statistics Organisation): Correct. The Central Statistics Organisation (CSO), now merged into the National Statistical Office, is the body that compiles and estimates India's national income and GDP data.
C (Planning commission): This body dealt with five year plans and resource allocation, not national income estimation, and it was also replaced by NITI Aayog in 2015.
D (Central Statistic Organisation): This looks like option B but has a typo, "Statistic" instead of "Statistics". The correctly named body is "Central Statistics Organisation", so this option does not match the real name.
The right answer is B, Central Statistics Organisation, the actual agency that computes India's national income estimates.