Which One of the Following Statements Appears to Be Correct

Which one of the following statements appears to be correct based on current research?

A) Single, female investors tend to earn lower returns than their male counterparts.
B) Overconfidence tends to result in lower returns.
C) Excessive trading tends to increase returns.
D) Men tend to trade less frequently than women.
E) Investors with higher incomes tend to be more risk-adverse than other investors.