API 571 Sour Water Corrosion

Sour water corrosion primarily affects?

Which of the following is NOT a critical factor contributing to sour water corrosion?
A) pH
B) Pressure
C) Temperature
D) H2S Concentration

Which of the following process chemicals is a critical factor contributing to Sour water corrosion?
A) Sulfur
B) Vanadium
C) Oxygen
D) Carbon
E) Hydrogen