Supply-Demand Imbalance and Advertising Effects Steps:

• Falling cocoa price indicates excess supply in the cocoa market, where quantity supplied exceeds quantity demanded, pushing price down.
• Rising prices of cocoa products indicate increased demand for those products, likely from higher advertising shifting the demand curve rightward.
• Advertising increase boosts consumer interest in end products, raising their prices despite lower input costs.
• Excess supply in cocoa could stem from high production, overpowering any derived demand increase from products.

Why C is correct:

• Excess supply lowers cocoa prices per basic supply-demand law; increased advertising raises product prices by expanding demand.

Why the others are wrong:

• A: Excess demand raises cocoa prices (opposite of falling); decreased advertising lowers product prices.
• B: Decreased advertising lowers product prices (opposite of rising).
• D: Excess demand raises cocoa prices (opposite of falling).

Final answer: C