What is the def of precedent

an earlier event or action that is regarded as an example or guide to be considered in subsequent similar circumstances

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google

the first question's answer is a.