John,Don,and Mary Demand 5,7,and 3 Cans of Cat Food,respectively,when the Price

Multiple Choice

John,Don,and Mary demand 5,7,and 3 cans of cat food,respectively,when the price is $1.50.If they are the only consumers,the market quantity demanded at a price of $1.50 is

A) 15 cans.
B) 10 cans.
C) 7 cans.
D) 5 cans.
E) 3 cans.