In the following reaction,which substance acts as a reducing agent?
$14H^+ + Cr_2O_7^{2-} + 3Ni \to 2Cr^{3+} + 7H_2O + 3Ni^{2+}$
$14H^+ + Cr_2O_7^{2-} + 3Ni \to 2Cr^{3+} + 7H_2O + 3Ni^{2+}$
- A$H_2O$
- B$Ni$
- C$H^+$
- D$Cr_2O_7^{2-}$
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