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.If the market price for milk is $4.50,market demand is:

A) zero units of milk.
B) 1.5 units of milk.
C) 1 units of milk.
D) 10 units of milk.