What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that has been in caustic service for welding?

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What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that has been in caustic service for welding?
A . Neutralize and clean the surface within 6 in. (150 mm) of weld bevels
B . Steam out the piping system and dry
C . Verify with pH paper that any surface liquid is “basic"
D . Grind the surfaces near the bevel to remove contaminants

Answer: A