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.The good is

A) an inferior good since the coefficient on $P _ { R }$ is positive.
B) a normal good since the coefficient on $P _ { R }$ is positive.
C) an inferior good since the coefficient on M is greater than one.
D) a normal good since the coefficient on M is positive.
E) none of the above