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) Rock and Roll Trivia is an inferior good.
B) computers and diskettes are substitutes.
C) computers and diskettes are complements.
D) computers are a normal good.
E) A, B and D are true.