A Standard Adult Dose of a Cough Suppressant Is 15

A standard adult dose of a cough suppressant is 15.0 mL. This portion contains 5.00 mg of the active ingredient. A pediatrician suggests that this medication can be given to children over the age of 6 years, but only if it is diluted so the dose is 1.00 mg in 20.0 mL. How many milliliters of the adult medicine would you need to use to make 100.0 mL of the child-strength cough suppressant?

A) 1.00 mL
B) 5.00 mL
C) 10.0 mL
D) 15.0 mL
E) 20.0 mL