Match the column :-

Column $I$ (Reduction process)	Column $II$ (Charge required)
$(a)$ $1$ mol of $MnO_4^-$ to $Mn^{2+}$	$(p)$ $193000$ $C$
$(b)$ $1$ mol of $Cr_2O_7^{2-}$ to $Cr^{3+}$	$(q)$ $289500$ $C$
$(c)$ $1$ mol of $Sn^{4+}$ to $Sn^{2+}$	$(r)$ $482500$ $C$
$(d)$ $1$ mol of $Al^{3+}$ to $Al$	$(s)$ $579000$ $C$

• A
  $a \to p, b \to r, c \to q, d \to s$
• B
  $a \to r, b \to s, c \to q, d \to p$
• C
  $a \to s, b \to q, c \to p, d \to r$
• D
  $a \to r, b \to s, c \to p, d \to q$