Use a Graphing Utility to Graph the Function and Then $\mathrm { M } ( \mathrm { x } )$

Multiple Choice

Use a graphing utility to graph the function and then answer the question.
-The number of mosquitoes $\mathrm { M } ( \mathrm { x } )$ , in millions, in a certain area depends on the June rainfall $x$ , in inches: $M ( x ) = 4 x - x ^ { 2 }$ . What rainfall produces the maximum number of mosquitoes?

A) 16 in.
B) 4 in.
C) 0 in.
D) 2 in.