[MCQ] What is External Sulphates Attack?

What is external sulphates attack?

[A] Sulphate are more usually are a result of high-sulphate soils
[B] Sulphate are more usually are a result of ground water
[C] Presence of natural gypsum in the aggregates
[D] Both (a) & (b)

ANSWER= [D] Both (a) & (b)
Explain:- Correct answer for the question What is external sulphates attack is [D] Both (a) & (b)

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