After changing the default runlevel in the init configuration file, the system boots in a different than
the intended runlevel. Where else could be this different runlevel be defined?

A.
Nowhere. The init configuration file wasn’t properly modified

B.
In the boot loader configuration file

C.
In /etc/ runlevel under default

D.
In the initrd image file

E.
In the /etc/rc.d/rc.local file

Explanation:
See http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-grub-runlevels.html or
http://www.comptechdoc.org/os/linux/usersguide/linux_uglilo.html