Find the Marginal Profit for Producing X Units $P = - 2 x ^ { 2 } + 72 x - 145$

Multiple Choice

Find the marginal profit for producing x units. (The profit is measured in dollars.) $P = - 2 x ^ { 2 } + 72 x - 145$

A) $- 4 x + 72 \text { dollars }$
B) $4 x + 72 \text { dollars }$
C) $- 4 x - 72 \text { dollars }$
D) $4 x - 72 \text { dollars }$
E) $- 4 + 72 x \text { dollars }$