Which one of the following is a correct statement regarding the effect of a shift in the demand curve or the supply curve on equilibrium price and quantity?
A. If the demand curve remains the same, a shift in the supply curve will change price and quantity in the same direction.
B. If the demand curve remains the same, a shift in the supply curve will not change price and quantity at all.
C. If the supply curve remains the same, a shift in the demand curve will change price and quantity in the same direction.
D. If the supply curve remains the same, a shift in the demand curve will not affect the price and quantity at all.
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