Acidity in water is caused due to 1: Mineral acids 2: Iron sulphate 3: Aluminium sulphate 4: All the above.

All the above

thank you for the question 

I didn't know so looked for it, thank you, all of the above

4: >>>>>>>>>>All the above.

I have heard about mineral acids...nt sure about the rest two options

Thank you Mr.Alex

All the above

I agree with the correct answer that all of you gave, ALL THE ABOVE

My answer is All of the above

is the correct answer