What Is the Total Number of Moles (N) of Electrons $\rarr$

Multiple Choice

What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation: 3C₂O₄^2-(aq) + Cr₂O₇^2-(aq) + 14H⁺(aq) $\rarr$ 6CO₂(g) + 2Cr³⁺(aq) + 7H₂O(l)

A) 3
B) 4
C) 5
D) 6
E) None of the above