In the Context of International Labor Relations,one of the Reasons

In the context of international labor relations,one of the reasons for a decline in union influence is the:

A) introduction of a reciprocal tax treaty.
B) retention of low-skilled tasks in an international firm's home country.
C) importing of employment practices and contractual agreements that are alien to the host country.
D) increased bargaining power of organized labor.
E) their increased ability to threaten to disrupt production, either by a strike or some other form of work protest.