Which substance is serving as the reducing agent in the following reaction? 14H* (aq) + Cr20,2-(aq) + 3Ni(s) 3NI2*(aq) + 2Cr3-(aq) + 7H20() Select one: O a. Ni O b. H*(aq). O c. Cr20,2-(aq) O d. H20() O e. Ni2+

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