Which of the following statements are correct concerning diversifiable, or unsystematic, risks? I. Diversifiable risks can be largely eliminated by investing in 25~50 unrelated securities. II. There is a reward for accepting diversifiable risks. III. Diversifiable risks are generally associated with an individual firm or industry. IV. Beta measures diversifiable risk.

A III and IV only

B. II and IV only

C. I, II and III only

D. I and III only