The correct form of nominative pronoun which stands as a subject of a sentence is B. she and her friends will go shopping at the mall. 'She and her friends' is a compound subject of the sentence because it consists of two nominative pronouns, both linked to the action (verb) of the sentence. The first sentence contains improper pronoun, as there must be subjective case instead of objective. In the C option the subject of a sentence is Terry (proper name). The last one, there is the same mistake as in the first option.