Which equation represents a neutralization reaction?

Which equation represents a neutralization reaction?

A. 4Fe(s) + 3O2(g) → 2Fe2O3(s)
B. 2H2(g) + O2(g) → 2H2O()
C. HNO3(aq) + KOH(aq) → KNO3(aq) + H2O()
D. AgNO3(aq) + KCl(aq) → KNO3(aq) + AgCl(s)