Which of the Following Statements Is the Most Accurate Concerning

Which of the following statements is the most accurate concerning security returns over the eight decades since the 1920's?

A) Returns on large common stocks were very stable
B) Returns on long-term corporate bonds were very stable
C) Returns on long-term corporate bonds were very stable.
D) Returns on treasury bills were very consistent from period to period
E) All securities exhibited very unstable returns over the eight decades in question.