Questions: An increase in demand for oil, along with a simultaneous increase in supply of oil, will Select one or more: a. increase quantity, but whether it increases price depends on how much each curve shifts. b. decrease price and increase quantity. c. increase price and decrease quantity. d. increase price, but whether it increases quantity depends on how much each curve shifts.

The answer is the first one (or A): increase quantity, but whether it increases price depends on how much each curve shifts.

Explanation for each option: a. Increase quantity, but whether it increases price depends on how much each curve shifts. - This is correct. When both demand and supply increase, the quantity will definitely increase. However, the effect on price depends on the relative magnitudes of the shifts in the demand and supply curves. If the demand increase is larger than the supply increase, the price will rise. If the supply increase is larger than the demand increase, the price will fall. If they increase by the same amount, the price will remain unchanged.

b. Decrease price and increase quantity. - This is incorrect. While the quantity will increase, the price does not necessarily decrease. The price could increase, decrease, or stay the same depending on the relative shifts of the demand and supply curves.

c. Increase price and decrease quantity. - This is incorrect. An increase in both demand and supply will not lead to a decrease in quantity. The quantity will increase, and the price could either increase, decrease, or stay the same.

d. Increase price, but whether it increases quantity depends on how much each curve shifts. - This is incorrect. The quantity will definitely increase when both demand and supply increase. The uncertainty lies in the price, not the quantity.

Summary: The correct answer is A: increase quantity, but whether it increases price depends on how much each curve shifts.