The processes involved in extracting zinc are listed. In what sequence are these processes carried out?
- A$1 \rightarrow 2 \rightarrow 3 \rightarrow 4$
- B$4 \rightarrow 3 \rightarrow 1 \rightarrow 2$
- C$4 \rightarrow 1 \rightarrow 3 \rightarrow 2$
- D$1 \rightarrow 4 \rightarrow 3 \rightarrow 2$