Select the correct answer.

Which expression is equivalent to this polynomial?

x$2+12$

A$.$

$($x$+23$i$)($x$23$i$)$

B$.$

$($x$+6$i$)($x$6$i$)$

C$.$

$($x$+23)2$

D$.$

$($x$+23)($x$23)$