Which of the following statements is most correct?
a. Diversifiable risk refers to risk arising from macro factors such as Fed’s monetary policy
b. In a fully diversified portfolio of stocks, only market risk remains
c. A stock’s standard deviation measure its diversifiable risk
d. An uncertain event is the same as a risky event in finance, even if it is not measurable
e. A stock portfolio has less risk than a single stock because stocks tend to move together, thus less volatility