In the Empirical Study of a Multi-Factor Model by Chen,Roll,and

In the empirical study of a multi-factor model by Chen,Roll,and Ross,a factor that did not appear to have significant explanatory power in explaining security returns was________.

A) the change in the expected rate of inflation
B) the risk premium on corporate bonds
C) the unexpected change in the rate of inflation
D) industrial production
E) B,C and D