Final answer:
The option b)China is the top-ranked country in exporting goods to the United States, due largely to its aggressive export policies and rapid economic growth.
Step-by-step explanation:
The top-ranked country among those exporting to the United States is b)China.
This is evident from various trade documents and statistics, including historical import data. For instance, data from 2015 highlights that China was one of the major origins for U.S. imports. Additionally, it is known that China has a rapid economic growth which can be attributed to factors such as cheap labor, high technology, and aggressive export strategies. This export-driven growth model positions China as a significant exporter to many countries, including the U.S. Despite trade tensions, where China has imposed higher tariffs on United States exports and banned imports of certain U.S. agricultural products, the sheer volume of exported goods from China to the U.S. keeps it at the top of the list.