Suppose you invest $20,000 by purchasing 200 shares of Abbott Labs (ABT) at $50 per share, 200 shares of Lowes (LOW) at $30 per share, and 100 shares of Ball Corporation (BLL) at $40 per share. Suppose over the next year Ball has a return of 12.7%, Lowes has a return of 23%, and Abbott Labs has a return of -10%. The return on your portfolio over the year is: O A. 8.9% OB. 0% OC. 4.4% OD. 6.7%