$\text{ For which of the following reactions is }{\mathrm{K}}_{\mathrm{p}}={\mathrm{K}}_{\mathrm{c}}\text{ ? }$

• A

  ${\mathrm{H}}_{2\left(g\right)}+{\mathrm{I}}_{2\left(g\right)}\rightleftharpoons 2{\mathrm{HI}}_{\left(g\right)}$

• B

  $2{\mathrm{N}}_2{\mathrm{O}}_{4\left(\mathrm{g}\right)}\rightleftharpoons 4{\mathrm{NO}}_{2\left(\mathrm{g}\right)}$

• C

  ${\mathrm{N}}_{2\left(\mathrm{g}\right)}+3{\mathrm{H}}_{2\left(\mathrm{g}\right)}\rightleftharpoons 2{\mathrm{NH}}_{3\left(\mathrm{g}\right)}$

• D

  ${\mathrm{H}}_{2\left(\mathrm{g}\right)}+{\mathrm{Cl}}_{2\left(\mathrm{g}\right)}\rightleftharpoons 2{\mathrm{HCl}}_{\left(\mathrm{g}\right)}$