Which of the Following Are Affected by the Probability of a State

Multiple Choice

Which of the following are affected by the probability of a state of the economy occurring?
I. expected return of an individual security
II. expected return of a portfolio
III. standard deviation of an individual security
IV. standard deviation of a portfolio

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