If the Demand Price for the 2,000^th Unit of a Good

If the demand price for the 2,000^th unit of a good is $10, then

A) total consumer surplus for 2,000 units is $10,000.
B) the economic value of the 2,000^th unit is $10.
C) consumer surplus for the 2,000^th unit can be computed by subtracting the supply price for the 2,000^th unit.
D) the net gain to society from the production and consumption of the 2,000^th unit can be computed by subtracting the supply price from $10.
E) Both b and d