The Following Linear Demand Specification Is Estimated for Conlan Enterprises,a $Q = a + b P + c M + d P _ { R }$

Multiple Choice

The following linear demand specification is estimated for Conlan Enterprises,a price-setting firm: $Q = a + b P + c M + d P _ { R }$ where Q is the quantity demanded of the product Conlan Enterprises sells,P is the price of that product,M is income,and $P _ { R }$ is the price of a related product.The results of the estimation are presented below: Given the above,based upon the parameter estimates in the above table

A) this good is a normal good.
B) the related good is a substitute.
C) the related good is a complement.
D) a and b
E) a and c