What illustrates the importance of voter registration?

Voter registration serves several vital functions, one of which is to ensure the integrity of the electoral process. By requiring individuals to register, the system can effectively identify and manage the number of eligible voters in a given jurisdiction. This mechanism plays a crucial role in preventing individuals from casting votes in multiple places during the same election cycle. It maintains the principle of one person, one vote, which is foundational to democratic practices.

While voter registration does contribute to higher voter turnout, allows for participation in local governance, and helps streamline the voting process, the most critical aspect is its role in safeguarding against fraudulent voting practices. Ensuring that each voter is registered to a specific location prohibits activities such as double voting, which can undermine the legitimacy of elections. This is why the correct answer highlights the preventive measures that voter registration puts in place against multiple voting instances.