The profit in dollars from the sale of x thousand compact disc players is P(x)=x⁽³⁾-9x⁽²⁾+5x+8 . Find the marginal profit when the value of x is 11 .
A. $170 per thousand compact disc players
B. $178 per thousand compact disc players
C. $349 per thousand compact disc players
D. $341 per thousand compact disc players