Final answer:
The requirement for naturalization is having a good moral character.
Step-by-step explanation:
The requirement that indicates an applicant for naturalization should have a clean criminal record is having a good moral character. This means that the applicant must demonstrate honesty, trustworthiness, and respect for the law. They should not have any serious criminal convictions or engage in activities that are contrary to good moral character.
Learn more about Naturalization requirement for a clean criminal record