How Did Hamilton Demonstrate His Dedication in Developing His Plan

How did Hamilton demonstrate his dedication in developing his plan for prosperity and security?

A) He consulted his friends and colleagues in Pennsylvania, Massachusetts, and Virginia.
B) He surveyed and patiently listened to his political enemies, especially Jefferson and Madison.
C) He traveled to England and France, studying their economic institutions and industrial centers.
D) He traveled around the United States, even into the Western Territories, to gain a true sense of the nation's fiscal status.
E) He conducted a survey of political and economic leaders on the subject.