You Have at Your Disposal 100

You have at your disposal 100.00 mL of 0.650 M HCl and 500.00 mL of 0.300 M NaOH. How many mL of the base have to be added to the full volume of the acid to reach a pH of 1.90?

A) 10.2 mL
B) 20.4 mL
C) 43.3 mL
D) 204 mL
E) 433 mL