15. The following reaction occurs in basic solution:

\[ \text{Ag}_{\text{(s)}} + \text{CN}^{-}_{\text{(aq)}} + \text{O}_{2\text{(g)}} \rightarrow \text{Ag(CN)}_{2}^{- \text{(aq)}} \]

When the equation is balanced by using the half-reaction method, the sum of the coefficients is:
(A) 10
(B) 20
(C) 18
(D) 16
(E) 23

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