The exact volume of 1 M NaOH solution required to neutralize 50 mL of 1 M H₃PO₃ solution and 100 mL of 2 M H₃PO₂ solution, respectively, are:
a) 75 mL, 150 mL
b) 100 mL, 200 mL
c) 150 mL, 300 mL
d) 200 mL, 400 mL