When Cities Dumped Sewage into Natural Waterways with Limited Capacity

When cities dumped sewage into natural waterways with limited capacity for dilution,

A) oxygen levels were severely lowered and most aquatic life died.
B) the extra organic matter fertilized the region,which quickly filled in with new plants.
C) the extra organic matter created fertile areas that attracted wildlife including migratory birds.
D) bacterial growth greatly increased and the sewage was safely recycled into soil.