Answer:
A.
Step-by-step explanation:
The struggles faced by Native Americans to vote was due to their non-US citizenship. Though Native Americans were the ones who were citizens of the US long before the States were formed yet they struggled to get the US citizenship and laws in favor of them for the protection of their rights.
The Native Americans were not allowed to vote after World War II asserting that they were citizens of the US who were staying on reservations.
Therefore the correct answer is option A.