Solve the Problem
-The Cost in Millions of Dollars for a Company

Multiple Choice

Solve the problem
-The cost in millions of dollars for a company to manufacture $x$ thousand automobiles is given by the function $C ( x ) = 4 x ^ { 2 } - 32 x + 128$ . Find the number of automobiles that must be produced to minimize the cost.

A) 8 thousand automobiles
B) 16 thousand automobiles
C) 64 thousand automobiles
D) 4 thousand automobiles