Making which of the following individual changes (in other words, make these changes one at a time), decreases the risk of the stock that is shown in Question 4 above?

(I) Changing the return in the normal state to 6% from 5%

(II) Changing the return in the boom state to 20% from 15%

(III) Changing the return in the bust state to -3% from -5%

I, II and III

I and III only

III only

II only

I only