Eutrophication starts when the concentration of nitrate ions and other ions in water rises. The stages involved in eutrophication are given below. Which is the correct sequence?
- A$3 \rightarrow 2 \rightarrow 1 \rightarrow 4$
- B$3 \rightarrow 4 \rightarrow 2 \rightarrow 1$
- C$4 \rightarrow 1 \rightarrow 2 \rightarrow 3$
- D$4 \rightarrow 1 \rightarrow 3 \rightarrow 2$