John's portfolio is comprised of 30 percent of stock X, 10 percent of stock Y, and the remaining of stock Z. Stock X has a beta of 1.16, stock Y has a beta of 1.47, and stock Z has a beta of 0.42. What is the beta of John's portfolio? A) 1.21 B) 1.13 C) 1.17 D) 0.75 E) 1.09