A solution of acetic acid, CH3CO2H, is prepared by dissolving 30.0 mL of acetic acid in enough water to give a total volume of 150.0 mL. What is the percent-by-volume

A solution of acetic acid, CH3CO2H, is prepared by dissolving 30.0 mL of acetic acid in enough water to give a total volume of 150.0 mL. What is the percent-by-volume concentration of acetic acid?
A)16.7%
B)15.0%
C)30.0%
D)20.0%
E)25.0%