Kyle is writing an argument in favor of raising the legal voting age. Which of the following paragraphs provides the clearest context, or background, for his claim?

A.
The extension of the right to vote to young adults is harmful to our nation. The legal voting age should be raised.
B.
Just like the Eighteenth Amendment was later repealed, the Twenty-Sixth Amendment should also be repealed, and the voting age restored to 21.
C.
Young people have different perspectives on issues than adults. They don’t understand the complexities of our political system or the key issues involved. That’s why they shouldn’t be allowed to vote.
D.
In the United States, the voting age was once 21. Then, in 1971, the Twenty-Sixth Amendment to the Constitution lowered the voting age to 18. After more than forty years, it’s clear that lowering the voting age was a mistake. It’s time to raise the legal voting age back to 21.