API RP 571 discusses this under Wet H₂S Damage – Hydrogen Blistering, HIC, SOHIC:
“Hydrogen generation is reduced as pH increases. At pH 9 and above, the corrosion potential is less favorable for hydrogen charging and thus permeation into the steel is minimal.”
“Most wet H₂S cracking damage mechanisms are accelerated under acidic conditions (pH < 7).”
Hence, high pH (around 9) environments offer the most protection against hydrogen damage, making option D the correct choice.
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