已知集合 $U=\left\{1,2,3,4,5\right\},A=\left\{1,3\right\},B=\left\{2,3,5\right\}$，则 ${\complement }_U\left(A\cup B\right)=$（ ）

A．

$\left\{1,2,3,4\right\}$

B．

$\left\{2,3,4\right\}$

C．

$\left\{2,4\right\}$

D．

$\left\{4\right\}$