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. From this demand curve, one can infer that:

A) an increase in advertising will cause an increase in the demand for Rock and Roll Trivia.
B) Rock and Roll Trivia and computers are substitutes.
C) Rock and Roll Trivia and diskettes are substitutes.
D) all of the above
E) none of the above