Which of the Following Is a New Restrictive Law Implemented

Which of the following is a new restrictive law implemented by Arizona? 

A)  All the voters must be twenty-one years of age to be eligible to vote. 
B)  The voter must first obtain a driving license before registering to vote. 
C)  The voters must cast their votes only through the mail-in voting system. 
D)  All the voters who have just turned eighteen should only register themselves on Election Day. 
E)  The voter must provide his or her proof of citizenship to vote in state elections.