Assume That a Market Demand Curve Is Constructed from Twenty

Assume that a market demand curve is constructed from twenty identical individual demand curves.Assume also that at a price of $10,the elasticity of individual demand is 0.5.Then,at this price,the elasticity of the market demand curve derived from these individual demand curves must be:

A) 5
B) any value more than 5.0.
C) any value less than 5.0.
D) 0.5.