Suppose you invest $20,000 by purchasing 200 shares of AbbottLabs(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 12.9%, Lowes has a return of 21%, and Abbott Labs has a return of 10%. The return on your portfolio over the year is: A. 0% B. 7.8% C. 3.9% D. 5.8%