Answer:
literacy test
Poll Taxes
Grandfather Clauses
I believe the last is limits on early voting but the first 3 were used
D. Increasing access to higher education will decrease citizens' participation in government.
The numbers show that people with a higher education will participate more in government.
The largest desert in the world is technically in Antarctica; so this would be a correct answer. If you're looking for a more "typical" deserts, you could go with Africa, with its Sahara and numerous other deserts too.