We Can Derive a Market Demand Curve for an Item

Multiple Choice

We can derive a market demand curve for an item by:

A) multiplying each individual's demand curve by the number of consumers in the marketplace.
B) summing all of the quantities that would be demanded by individual consumers at different prices for that good and plotting the total quantities against price.
C) looking at how the equilibrium changes when we shift each individual's supply curve.
D) subtracting the price of an item from the supply curve.