Five hundred milligrams of phenoxymethyl penicillin is e quiv alent to approximately how many units of penicillin activity

Five hundred milligrams of phenoxymethyl penicillin is e quiv alent to approximately how many units of penicillin activity?
A) 125,000
B) 200,000
C) 1600
D) 250,000
E) 800,000***