What Is a Central Difficulty in Identifying Foreign Interests

What is a central difficulty in identifying foreign interests?

A) Foreign interests typically align with American interests, so most issues are not clearly foreign or domestic.
B) Many American firms are financed by foreign nations.
C) Many American firms send much of their work overseas, and many foreign firms have large operations and workforces in the United States.
D) Many top executives of American firms are foreign citizens.
E) Most interest groups have a department devoted to foreign affairs.