Synonym of KNUCKLE

Answer: Option B

Resign : voluntarily leave a job or office.
Surrender : stop resisting to an enemy or opponent and submit to their authority.
Face : the front part of a person's head from the forehead to the chin, or the corresponding part in an animal.
Struggle : make forceful or violent efforts to get free of restraint or constriction.
Knuckle : surrender.

Synonym of Knuckle is Surrender