Correct Option: C

Bacteria, algae and virus are all biotic. The non-biotic pollutant of underground water is arsenic. It may be found in water which has flowed through arsenic-rich rocks. Immediate symptoms on an acute poisoning typically include vomiting, oesophageal and diarrhoea pain, and bloody "rice water" diarrhoea. Chelation therapy may be effective in acute poisoning but should not be used against long-term poisoning.