The most credible source of research data from the options presented is: "a biographical piece in a history magazine highlighting George Washington's Career." (Option D).
A credible source of research information is a source that is open to peer reviews, and which has a reputation for carrying out primary research.
Examples of such are:
Hence, it is right to state that The most credible source of research data from the options presented is: "a biographical piece in a history magazine highlighting George Washington's Career."
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