Sơ đồ phản ứng nào sau đây đúng (mỗi mũi tên biểu diễn một phản ứng

A. ${\mathrm{FeS}}_2 \to \mathrm{Fe}{\left({\mathrm{NO}}_3\right)}_2 \to \mathrm{Fe}{\left(\mathrm{OH}\right)}_2$$\to \mathrm{Fe}{\left(\mathrm{OH}\right)}_3$$\to {\mathrm{Fe}}_2{\mathrm{O}}_3\to \mathrm{Fe}.$

B. ${\mathrm{FeS}}_2 \to \mathrm{FeO} \to {\mathrm{FeSO}}_4\to \mathrm{Fe}{\left(\mathrm{OH}\right)}_2$$\to \mathrm{FeO}\to \mathrm{Fe}.$

C. ${\mathrm{FeS}}_2 \to {\mathrm{Fe}}_2{\mathrm{O}}_3 \to {\mathrm{FeCl}}_3\to$$\mathrm{Fe}{\left(\mathrm{OH}\right)}_3$$\to {\mathrm{Fe}}_2{\text{O}}_3\to \mathrm{Fe}.$

D. ${\mathrm{FeS}}_2 \to {\mathrm{Fe}}_2{\mathrm{O}}_3 \to \mathrm{Fe}{\left({\mathrm{NO}}_3\right)}_2\to$$\mathrm{Fe}{\left(\mathrm{OH}\right)}_2$$\to \mathrm{Fe}{\left(\mathrm{OH}\right)}_2\to \mathrm{Fe}.$