The reaction of potassium hydroxide with nitric acid in
water is given by the following equation:

a. KOH (aq) + HNO3 (aq) > H2O + NO (g) + KO2 (aq)

b. KOH (aq) + HNO3 (aq) > KNO3 (aq) + H2 (g)

c. KOH (aq) + HNO3 (aq) > H2O + KNO3 (aq)

d. KOH (aq) + HNO3 (aq) > no reaction

KOH + HNO_3 \rightleftharpoons K^+ + OH^- + H^+ + NO_3^-

Basically, the starting materials ionize. If you trade cations (K+ and H+) and anions (OH- and NO3-), you'll get the products. The question boils down to, what do H+ and OH- combine to form and what do K+ and NO3- combine to form and, do the products decompose?