In a Study Conducted by Jagannathan and Wang, It Was

In a study conducted by Jagannathan and Wang, it was found that the performance of beta in explaining security returns could be considerably enhanced by:
I. Including the unsystematic risk of a stock
II. Including human capital in the market portfolio
III. Allowing for changes in beta over time

A) I and II only
B) II and III only
C) I and III only
D) I, II, and III

Correct Answer:

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