Managerial Economics- Linear Demand Function- what would the law of demand require in this situation?

The general linear demand function below is used to answer the following question:
Qd = a + bP + cM + dPr
Where Qd = quantity demanded, P = the price of the good, M = income, Pr = price of a good related in consumption

The law of demand requires that:
A) a < 0
B) b < 0
C) P < 0
D) a < 0and b < 0
 
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