Scenario 5-1 Suppose That When the Average College Student's Income Is $10,000

Scenario 5-1
Suppose that when the average college student's income is $10,000 per year,the annual quantity demanded of Patty's Pizza is 50 and the annual quantity demanded of Sue's Subs is 80.Suppose that when the price of Patty's Pizza increases from $8 to $10 per pie,the quantity demanded of Sue's Subs increases from 80 to 100.Suppose also that when the average student's income increases to $12,000 per year,the annual quantity demanded of Patty's Pizza increases from 50 to 60.
-Refer to Scenario 5-1.Using the midpoint method,the cross price elasticity of demand is

A) about 0.22,and the two goods are substitutes.
B) about -0.005,and the two goods are complements.
C) 1,and the two goods are substitutes.
D) 1,and the two goods are unitary elastic.