Which of the following is NOT a double displacement reaction?

A

$$ CuSO_{4} + H_{2}S \rightarrow CuS + H_{2}SO_{4} $$

B

$$ Mg_{3}N_{2} + 6H_{2}O \rightarrow 3Mg(OH)_{2} + 2NH_{3} $$

C

$$ BaCl_{2} + H_{2}SO_{4} \rightarrow BaSO_{4} + 2HCl $$

D

$$ NaOH + HCl \rightarrow NaCl + H_{2}O $$