Consider two perfectly negatively correlated (correlation coefficient= -1) risky securities, A and B. Security A has an expected rate of return of 16% and a standard deviation of return of 20%. B has an expected rate of return of 10% and a standard deviation of return of 30%. The weight of security B in the minimum-variance portfolio is _________.

PLEASE SHOW ALL WORK

A. 20% B. 60% C. 40% D. 10%