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A lake near a village suffered heavy mor...

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this? a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity b) The area was sprayed with DDT by an aircraft c) The lake water turned green and stinky d)Phvtoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in this lake?

A

b and c

B

c and d

C

a and c

D

a and b

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