Which sentence contains the main idea in a paragraph?

Right to vote

Explanation:

Out of the options given, the right to vote is the right that only US citizens have. In order to vote in elections, you have to be a US citizen, either by birth or by naturalization. You also need to meet your state's residency requirements and be at least 18 years of age (although some states might allow 17-years-old to vote in primaries).