The factor that helped the inland transportation and commerce to be possible in US country is the complexity of various river systems.
Option C is correct.
What is commerce?
Commerce is referring to the technique of acquisition and disposal of goods or services. It includes trading from state to state or city to city or even nation to nation. It includes the goods or services being taken from the worldwide nations called import whereas when the home countries send goods or services to outside nations called exports.
The inland transportation is representing the moving of goods within the US country through use of waterways like ships, cargoes, boats, etc., roads and rails. The complex river systems made easier for the possibility of transportation over land and activities relating to commerce in the US country.
Therefore, the river systems are considered to be the only factor that made possible the inland transportation and commerce.
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