Answer:
A change in the expectations of consumers about prices - a shift of the demand curve for peanut butter
A decrease in the price of peanut butter - a movement along the demand curve for peanut butter
A decrease in the number of consumers - a shift of the demand curve for peanut butter
Explanation:
Only a change in price of a product would lead to a movement along the demand curve for that product.
A decrease in the price of peanut butter would increase the quantity demanded for butter. This would lead to a movement down the demand curve.
A change in the expectations of consumers about prices can shift demand curve either to the left or right.
A decrease in the number of consumers would shift the demand curve to the left.
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