The correct option is C herself
Intensive pronounces end in either –self (if it is singular) or –selves (if it is plural). They are myself, ourselves, herself, himself, itself, themselves, yourself, and yourselves. We can use these pronouns to add emphasis to a sentence. Here emphasis is added to the fact that my friend, in third person, cut none other than his own self, that is, herself. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.