Estimated Demand for a Good Is $\hat { Q } = 25 - 5 P + 0.32 M + 12 P _ { R }$

estimated demand for a good is $\hat { Q } = 25 - 5 P + 0.32 M + 12 P _ { R }$ where Q is the quantity demanded of the good,P is the price of the good,M is income,and $P _ { R }$ is the price of related good R.This good and the related good R are

A) complements since the coefficient on M is positive.
B) substitutes since the coefficient on M is positive.
C) complements since the coefficient on $P _ { R }$ is positive.
D) substitutes since the coefficient on $P _ { R }$ is positive.