Answer :
From the available options, the requirement that is not a voting requirement mandated by all 50 states is voter registration.
Many states in the United States require voter ID before the electorates can be allowed to vote. However, some states don't require voter ID before allowing electorates to vote.
Also, the Voter ID doesn't mean voter registration; it only means any form of authenticated ID.
On the other hand, all the states in the federation do ask voters for three main requirements, which include US citizenship, state residency, and age (minimum of 18).
Hence, in this case, it is concluded that the correct answer is option C. "Voter registration."
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