Water pollution caused by drains could be avoided or reduced by ____.
ASpeedy disposal and proper treatment
BRegular servicing of vehicles and using clean fuels
CSewage treatment before disposal
DDischarging domestic waste into rivers.
Water pollution caused by drains could be avoided or reduced by ____.
ASpeedy disposal and proper treatment
BRegular servicing of vehicles and using clean fuels
CSewage treatment before disposal
DDischarging domestic waste into rivers.