 In his solution to the question, Brito considers only positions (i) and (iii), the first of which he attributes to Avicenna and the second to Averroes. He sides with Avicenna and supports his position with both authoritative and epistemological arguments: the subject matter of metaphysics is being, not only because Aristotle says so in Met. Γ.1.1003a20–23, but also because, just as the science of being must do, the Metaphysics deals with the parts and attributes of being in general (e.g., in its discussion of first substances, form and matter, truth and unity, etc.), as well as with its causes and principles (e.g., in its discussion of the causes of being in Metaphysics. A and E) (QMet: I.1).