Write a Balanced Chemical Equation Which Corresponds to the Following

Write a balanced chemical equation which corresponds to the following equilibrium constant expression.
$K = \frac { \left[ \mathrm { NO } _ { 2 } ^ { - } \right] \left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right] } { \left[ \mathrm { HNO } _ { 2 } \right] }$

A) HNO₂(aq) + H₂O( $\ell$ ) $\rightleftharpoons$ NO₂^-(aq) + H₃O⁺(aq)
B) NO₂^-(aq) + H₃O⁺(aq) $\rightleftharpoons$ HNO₂(aq) + H₂O( $\ell$ )
C) NO₂^-(aq) + H₃O⁺(aq) $\rightleftharpoons$ HNO₂(aq)
D) H⁺(aq) + OH^-(aq) $\rightleftharpoons$ H₂O( $\ell$ )
E) HNO₂(aq) $\rightleftharpoons$ NO₂^-(aq) + H₃O⁺(aq)