Which type of regulations cannot be altered by the EMS commission?

The correct choice is statutes, as they are laws enacted by a legislative body and hold legal authority. Statutes establish the framework for EMS operations and are more formal and binding than other types of regulations. Unlike rules, guidelines, and policies— which can be revised, interpreted, or adjusted by an agency like the EMS commission—statutes require a legislative process for modification. This means that any changes to statutes involve drafting, proposing, and passing new legislation, often requiring significant time and public input. Thus, the EMS commission does not have the authority to unilaterally alter statutes, making this answer accurate.