On Broad, Long-Term Foreign Policy Issues, Such as American Participation

On broad, long-term foreign policy issues, such as American participation in the North Atlantic Free Trade Agreement, larger business and industry groups find it difficult to get their members to speak with a single voice because:

A) they find it difficult, as is the case in domestic policy lobbying, to overcome the free-rider problem.
B) their members tend to pay more attention to domestic than foreign news, like most other Americans.
C) the complexity of most foreign policy issues overwhelms many members.
D) members may have many varying, and sometimes conflicting, economic interests that lead them to see policies in diverse ways.