Outsourcing the Performance of Value Chain Activities Presently Performed In-House

Outsourcing the performance of value chain activities presently performed in-house to outside vendors and suppliers makes strategic sense EXCEPT when

A) an activity can be performed better or more cheaply by outside specialists.
B) it allows a company to focus its entire energies on its core business.
C) it restricts a company's ability to assemble diverse kinds of expertise speedily and efficiently.
D) it reduces the company's risk exposure to changing technology and/or changing buyer preferences.
E) it allows a company to leverage its key resources.