Final answer:
Parents or guardians are required to sign a consent form before their minor athlete can travel with an adult, in accordance with the US Center for SafeSport Minor Athlete Abuse Prevention Policies.
Step-by-step explanation:
The US Center for SafeSport Minor Athlete Abuse Prevention Policies necessitate certain actions from parents or guardians before allowing their minor athlete to travel with an adult. In this context, the correct action required is that they must sign a consent form. This form serves to provide informed consent, which includes a comprehensive written description of what the minor can expect during the trip, including any potential risks. Additionally, this consent form confirms that the minor's participation is voluntary and can be ceased at any time without penalty. When it comes to research or experiments, the concept of informed consent is similarly applied, as participants must sign an informed consent form before participating in a study. For minors, this requirement is underlined by the need for a parent or legal guardian to sign on their behalf.