Which of the following is most likely to produce scientific evidence about a theory ?

A. An economist employed by the Trades union congress doing research on the impact of trade policy on workers wages

B. An economist permanently employed at a leading university analyzing the impact of bank regulations on lending to small businesses

C. A radio talk show host collecting data from listeners on how capital markets respond to taxation

D. A lawyer employed by Renault addressing the impact of air bags on passenger safety.

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