Question

dangerous left out materials are mainly used- (a) to fill the low land (b) used as fuel in an industry (c) for building materials 

Answer 1

Dangerous left out materials are mainly used for building materials like Asbestos.

Though this metirials also used in finnling low land but its past, now its band to use this dangerous materials to fill low planes since its doing harm than good..

Answer 2

(C) for building materials.

I think because they should have some use......