Concept:The share of public expenditure in a country's GDP reveals the extent of government participation in the economy.
Explanation:Public expenditure is the spending undertaken by the government on goods, services, and public projects.
In a pure market economy, this share would be very small because private individuals and firms control production.
In a planned economy, the government owns resources, so public expenditure would dominate nearly all of GDP.
In a traditional economy, resource allocation is based on custom and barter rather than government spending.
However, when GDP is made up of both public expenditure and private expenditure, the government and the market share economic decisions.
This combination of state participation and private enterprise is the key feature of a mixed economy.
Answer:D. Mixed