Correct Answer: Option A

Explanation

The demand curve for a product can shift due to several factors, one of which is a change in consumers' income. If consumers'
income increases, they have more purchasing power and are likely to buy more of the product, thus shifting the demand curve to
the right. The other options do not cause a shift in the demand curve. A rise in the price of cocoa or a tax on cocoa producers
would cause a movement along the demand curve, not a shift. A fall in the quantity demanded of cocoa is a result of a shift in the
demand curve, not a cause.

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