Scenario 4.4: the Demand Curve for the New Computer Game, Rock and Rock

Scenario 4.4:
The demand curve for the new computer game, Rock and Roll Trivia, is given as follows:
Q = 200 - 5P - .1Pc - .5Pd + .2A - I
where P is the price of the game
Pc is the price of a computer
Pd is the price of a diskette
A is the level of advertising
Q is the level of income
-See the information in Scenario 4.4. Suppose P = 10, Pc = 100, Pd = 2, A = 5, and I = 50. What is the income elasticity of demand?

A) 0
B) 5/9
C) 1
D) 9/5
E) none of the above