The Market Demand for a Monopoly Firm Is Estimated to Be

The market demand for a monopoly firm is estimated to be: $Q _ { d } = 100,000 - 500 P + 2 M + 5000 P _ { R }$ where $Q _ { d }$ is quantity demanded,P is price,M is income,and $P _ { R }$ is the price of a related good.The manager has forecasted the values of M and $P _ { R }$ will be $50,000 and $20,respectively,in 2021.For 2021,the forecasted demand function is

A) $Q _ { d }$ = 300,000 - 500P
B) $Q _ { d }$ = 100,000 -100P
C) $Q _ { d }$ = 600,000 -100P
D) $Q _ { d }$ = 200,000 - 500P
E) none of the above