Why are liners laid down at the bottom of a landfill before waste is deposited in the landfill?


A.) to prevent bacteria from the soil entering and decomposing the trash

B.) to provide a system for capturing usable water from trash

C.) to prevent hazardous substances in the trash from leaking into the groundwater

D.) to provide a way to collect methane gas building up in the trash


If you could help me...That would be great. Thank you ;) :)