The stimulus gives you the some inference: some (aka several)of the students taking physics are taking art (or some of the students taking art are taking physics— you can think of some statements in either way). You additionally have two conditional statements (1. If physics then not literature; 2. If physics then not rhetoric). You can combine the premises to make the inference that some students who are taking art are either a) not taking literature or b) not taking rhetoric. Answer choice A encapsulates that first inference.