Which of the following is considered a legal hair-control device in wrestling?

A legal hair-control device in wrestling must meet specific regulations set forth by wrestling governing bodies to ensure safety and fairness during competition. Rubber bands are permissible because they are designed to hold hair in place without posing a risk to the wrestler, as they do not have sharp edges or protrusions that could cause injury.

On the other hand, metal clips are not allowed because they can be dangerous, potentially causing cuts or injury during a match. Hair gel, while it can be used for styling, does not serve as a physical means of controlling hair during competition and does not meet the criteria necessary to secure hair effectively. Wrestling headgear is primarily intended for ear protection and while it can keep some hair in place, it is not specifically a hair-control device as defined by wrestling regulations. Thus, rubber bands are the best choice as they fulfill both the regulatory requirements and practical needs for hair management in wrestling.