Which of the following is a hazard associated with in-service welding on a carbon steel pipe containing chlorine?

Which of the following is a hazard associated with in-service welding on a carbon steel pipe containing chlorine?
A . Explosion or unstable reaction with the addition of localized heat.
B . Exothermic decomposition or explosion.
C . Carbon steel will burn in the presence of chlorine and high heat.
D . Hydrogen released during welding process can initiate hydrogen-assisted cracking.

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Answer: A