To Prepare 100 ML 0

To prepare 100 mL 0.4 M HCl from a stock solution of 2 M HCl one needs to ________.

A) dilute 20 mL 2 M HCl with 100 mL HCl
B) dilute 20 mL 2 M HCl with enough water to make a total volume of 100 mL solution
C) use 500 mL 2 M HCl and boil it down to a final volume of 100 mL solution
D) dilute 80 mL 2 M HCl to a total volume of 100 mL solution