Final answer:
The statement about Canada, Mexico, and the United States having less freshwater is an example of resource distribution, as it refers to the geographic and demographic spread of this natural resource.
Step-by-step explanation:
The statement that Canada, Mexico, and the United States all have less freshwater available is an example of resource distribution. Water is a renewable resource, but its availability is affected by its uneven distribution across the Earth. Factors such as climate, overuse, and water pollution compound to create a water crisis affecting many regions.
Countries must often work together to implement strategies to extend our fresh water supply and move towards sustainability. While environmental cooperation may be required to effectively address these issues, the statement in question specifically refers to how resources, in this case freshwater, are distributed geographically and demographically. As such, the answer is "c. Resource distribution".