Final answer:
The statement that the nature of cargo necessitating stops under regulations is true because the transportation of hazardous materials is governed by strict guidelines from federal and state agencies.
Step-by-step explanation:
The statement that "The nature of the cargo makes a stop mandatory under state or federal regulations" is generally true. Regulations set by the United States Department of Transportation and the Environmental Protection Agency dictate how certain hazardous materials and wastes must be handled during transport. For example, if a ship is carrying hazardous materials, it must adhere to strict guidelines that can include mandatory stops for inspections, or specific port requirements to ensure that the cargo is handled safely and in accordance with the law. Therefore, the nature of the cargo, if classified as hazardous, can indeed necessitate mandatory stops under both state and federal regulations.