In an economy, weapons production rises while consumer-goods production falls and total GDP remains unchanged. What conclusion about welfare is appropriate?

Correct answer: Welfare may change because the composition of output changes, so GDP alone is insufficient

The relevant concept is the composition of output. GDP adds the market value of final goods and can remain constant even when the mix of goods changes. Weapons may contribute to measured GDP, but fewer consumer goods can reduce direct consumption benefits; the welfare effect also depends on security needs and social priorities. Therefore option C is the careful conclusion. Options A and B claim certainty, and D incorrectly excludes weapons from GDP.