Solve the Problem
-Bob Owns a Watch Repair Shop $c ( x ) = 4 x ^ { 2 } - 208 x + 49$

Multiple Choice

Solve the problem
-Bob owns a watch repair shop. He has found that the cost of operating his shop is given by $c ( x ) = 4 x ^ { 2 } - 208 x + 49$ , where $c$ is cost and $x$ is the number of watches repaired. How many watches must he repair to have the lowest cost?

A) 26 watches
B) 49 watches
C) 40 watches
D) 24 watches