A scientist observed a sudden increase in the number of algae in a lake over a few days. The reason behind it could be that ____________.
A Water cycle in the area got unbalanced
B Electronic wastes were being dumped in a nearby area
C A factory with heavy smoke discharge has been established nearby
D Heavy amount of chemical fertilisers were being used in a nearby field
dddddddddddddddddddddddddddddddddddddddd is the ans