Final answer:
At each successive level of educational attainment, the voting rate increases.
Step-by-step explanation:
The statement that is true about voting in the United States is d. At each successive level of educational attainment, the voting rate increases. This means that individuals with higher levels of education are more likely to vote compared to those with lower levels of education.
For example, data from the U.S. Census Bureau shows that in the 2016 presidential election, 70.9% of individuals with at least a bachelor's degree voted, while only 41.2% of individuals with less than a high school diploma voted.
It is important to note that the other statements provided are not accurate or supported by historical data.
Learn more about voting in the United States