$\text {where \(Q\) is the quantity demanded of good \(A ; P A = \$ 10\), price of good \(A ; P _ { B } = \$ 8\), price of good }$

$$\mathrm { Q } = - 6,500 - 100 \mathrm { P } _ { \mathrm { A } } + 50 \mathrm {~PB} + .3 \mathrm { I } + .2 \mathrm {~A} ; \mathrm { R } ^ { 2 } = .12 , ( 2,500 ) ( 50 ) ( 30 ) ( .1 ) ( .08 )$$
$\text {where \(Q\) is the quantity demanded of good \(A ; P A = \$ 10\) , price of good \(A ; P _ { B } = \$ 8\) , price of good }$
$\text {\(B ; I = \$ 12,000\) , per capita income; and \(A = \$ 20,000\) , monthly advertising expenditures.}$
-Which of the following cannot be determined on the basis of the above regression results?

A) the degree of price elasticity of good B
B) whether or not good A is "normal"
C) the degree of competition between A and B
D) All of the above can be determined.