If a certain vitamin pill has \(400\) milligrams of magnesium, then how many grams of magnesium are in a bottle of \(500\) vitamin pills? (\(1\) gram \(= 1,000\) milligrams)
A. \(20\)
B. \(200\)
C. \(2,000\)
D. \(20,000\)
E. \(200,000\)
OA B