In the Following Reaction, Which Species Is the Reducing Agent $\rightarrow$

Multiple Choice

In the following reaction, which species is the reducing agent?
3 Cu (s) + 6 H⁺ (aq) + 2 HNO₃ (aq) $\rightarrow$ 3 Cu⁺² (aq) + 2 NO (g) + 4 H₂O (l)

A) H⁺
B) Cu
C) N in NO
D) Cu⁺²