The Demand for Video Recorders Has Been Estimated to Be

The demand for video recorders has been estimated to be linear and given by the demand relation Q_v = 145 − 3.2P_v + 7M − 0.95P_f − 39P_m,where Q_v is the quantity of video recorders,P_f denotes the price of video recorder film,P_m is the price of attending a movie,P_v is the price of video recorders,and M is income.Based on the estimated demand equation we can conclude:

A) video recorders are normal goods.
B) the demand for video recorders is inelastic.
C) video recorders are normal goods and the demand for video recorders is inelastic.
D) video recorders are normal goods and video recorder film is a complement for video recorders.