Which of the Following Affect the Expected Rate of Return

Multiple Choice

Which of the following affect the expected rate of return for a portfolio?
I. weight of each security held in the portfolio
II. the probability of various economic states occurring
III. the variance of each individual security
IV. the expected rate of return of each security given each economic state

A) I and IV only
B) II and IV only
C) II, III, and IV only
D) I, II, and IV only
E) I, II, III, and IV