It ought to be her with whom you share your secrets, not me.
Option(A) is correct After the different forms of the verb to be, we use subject forms of pronouns, except after the infinitive where we use the object form.
940 MCQ for effective preparation of the test of Subject Verb Agreement of English Grammar section.
Read the MCQ statement: It ought to be her with whom you share your secrets, not me., keenly and apply the method you have learn through the video lessons for Subject Verb Agreement to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 112-4391.