Which route pattern will be matched if a user dials the toll-free number 18005550123?

Refer to the exhibit.

To reach an external number, a user first dials a 9.

Which route pattern will be matched if a user dials the toll-free number 18005550123?
A . 911
B . 9.[2-9]XXXXXX
C . 9.1[2-9]XX[2-9]XXXXXX
D . 9.1800XXXXXXX
E . 9.1866XXXXXXX
F . 9.1877XXXXXXX
G . 9.1888XXXXXXX
H . 9.1900XXXXXXX
. 9011!

Answer: D