Which of the Following Statements Is Legally True

 Which of the following statements is legally true?  

A)  Because women as a group live longer than men, an employer may pay them monthly retirement benefits smaller than those received by men. 
B)  A state can set different ages at which men and women legally become adults. 
C)  High schools may pay the coaches of girls' sports less than they pay the coaches of boys' sports. 
D)  States can give widows a property-tax exemption not given to widowers.  
E)  All of these are correct.