To Derive a Market Demand Curve from Individual Demand Curves

To derive a market demand curve from individual demand curves, it would be necessary to:

A) take the maximum quantity of each demand curve as the market quantity demanded at each price.
B) sum the curves horizontally, adding quantities demanded at each price.
C) take the demand curve that is the furthest to the right as the market demand curve.
D) multiply the quantities demanded on each demand curve at each price to find the market quantity demanded at each price.