Economics Question: How do changes in consumer confidence and business sentiment influence economic activity, and what indicators can help measure these factors? A$)$ Changes in confidence and sentiment have no impact on economic activity, and there are no indicators to measure them. B$)$ Increased consumer confidence and business sentiment lead to decreased spending and investment. C$)$ Changes in consumer confidence can affect consumer spending, while changes in business sentiment can impact investment decisions; indicators like consumer surveys and business surveys measure these factors. D$)$ Changes in confidence and sentiment only matter for short$-$term economic fluctuations and have no long$-$term effects.

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