In relation to the studies by Coats (2008) and Coats and Rustichini (2009) on testosterone, which of the following statements is true: 1) People who have higher testosterone earn more money. II) Higher testosterone leads to risk aversion in career choices III) People with higher the testosterone have higher the 2D:4D ratio, hence they make more money a. Only I and II O b. Only II and III C. All I, II and III are true O d. None of the statements are true