Final answer:
The primary difference between the Staggers Rail Act of 1980 and the 4R Act was that the Staggers Rail Act implemented full-scale deregulation of the railroad industry. Option a
Step-by-step explanation:
The Staggers Rail Act of 1980 was significant in the deregulation of the transportation industry, specifically the railroad sector. This Act allowed for more flexible pricing, reduced regulatory barriers for entry and exit, and gave railroad companies greater autonomy in making decisions about routes and services.
It contrasted with the 4R Act (Railroad Revitalization and Regulatory Reform Act of 1976), which had begun the process of rail deregulation but did not go as far as the Staggers Rail Act. The core difference between the two was that the Staggers Rail Act implemented full-scale deregulation of the railroad industry, which was not present in the 4R Act. option a