Which of the Following, If True, Most Supports the Argument

Which of the following, if true, most supports the argument in favor of global sourcing?

A) There is no scarcity of qualified personnel in and around Boston.
B) Studies show that by reconfiguring their value-chain systems or reengineering their business processes, companies can substantially improve their production efficiency and resource utilization.
C) Camden Audio, Echo's most formidable rival, follows a strategy of product diversification.
D) The rate of employee turnover at Echo has stabilized over the last decade.