Answer:
The Panama Canal has shortened trading routes.
Explanation:
Human environment interaction could be describe as objects made by Human that heavily modified the environment.
An example of human and environmental interaction could be buildings, Gold mines or road construction.
By this meaning the only option suitable for this question is "the Panama Canal has shorten trading routes", as the Panama canal is an artificial canal built by Human.
The other options represent different type of interaction between humans and environment: for example, the ural mountains form the boundary between Asia and Europe, as well as Canada has ten provinces and three territories, and Panama Borders are Costa Rica Colombia the Caribbean Sea and the pacific Ocean, are all type of border between countries made by Human but they don't adapt the environment.
Panama Is a bit smaller than South Carolina is just a comparison.
Central heating is a common feature in Canadian housing does not apply in regards to the environment.
