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

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

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

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

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

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