单选题 Price(Dollars per unit) Quantity Demanded (Units) Bert Ernie Grover Oscar 0.00 20 16 6 8 0.50 18 12 4 6 1.00 14 10 2 5 1.50 12 8 0 4 2.00 6 6 0 2 2.50 0 4 0 0 Refer to Table. If these are the only four buyers in the market, then the market quantity demanded at a price of $1.50 is