Suppose Julia and Zach Are the Only Consumers of Milk

Multiple Choice

Suppose Julia and Zach are the only consumers of milk.Julia's demand for milk is defined as Q^d_Julia = 12 - 3P at prices below $4 and zero for prices above $4.Zach's demand for milk is defined as Q^d_Zach = 10 - 2P at prices below $5 and zero for prices above $5.In this case,the market demand curve for milk is:

A) is upward sloping.
B) a downward sloping straight line.
C) kinked at a price of $5.
D) kinked at a price of $4.