The commonly used material for water supply pipes which has the properties of being strong not easily corroded and long life but is heavy and brittle is:

b) cast iron , this is the answer.

The commonly used material for water supply pipes is Cast Iron. It is strong, not easily corrode , long life but brittle.

a] cast iron has the properties of being strong,and not easy corroded.

yes correct answer is cast iron

cast iron i see most of the places , its strong durable and not easily corroded

pipe materials that doesn't corrode or break easily is cast iron