The correct answer is option 'C' - Ministry of Statistics and Programme Implementation.

The Ministry of Statistics and Programme Implementation (MoSPI) recently released the provisional estimates of National Income for the year 2021-22.

Explanation:
1. Ministry of Statistics and Programme Implementation (MoSPI):
- The Ministry of Statistics and Programme Implementation is a government body responsible for formulating statistical policies, coordinating statistical activities, and maintaining statistical standards in India.
- It is responsible for collecting, compiling, and disseminating statistical data on various socio-economic aspects of the country.
- MoSPI releases several important economic indicators and reports, including the National Accounts Statistics, which provides estimates of national income and other macroeconomic aggregates.

2. Provisional Estimates of National Income:
- National Income refers to the total value of all goods and services produced within a country during a specific period.
- The provisional estimates of National Income provide an early assessment of the economic performance of a country for a particular fiscal year.
- These estimates include various components such as Gross Domestic Product (GDP), Gross Value Added (GVA), and sector-wise contributions to the economy.
- They are usually released by the government or a designated statistical agency to give an initial understanding of the economic growth and development.

3. Significance of National Income Estimates:
- National Income estimates are crucial for policymakers, economists, and analysts as they provide insights into the overall health of the economy.
- These estimates help in assessing the growth rate, identifying the sectors driving economic expansion, and formulating appropriate policies to address any challenges or imbalances.
- They also serve as a benchmark for comparing the economic performance of different periods and countries.
- National Income estimates are used for forecasting future economic trends, evaluating the effectiveness of government policies, and making informed decisions regarding investments and business strategies.

In conclusion, the Ministry of Statistics and Programme Implementation (MoSPI) recently released the provisional estimates of National Income for the year 2021-22, which play a significant role in analyzing the economic performance of the country and formulating appropriate policies.