False. While the author can include his opinion, this shouldn't happen very often, as in a research paper, you are supposed to mainly be stating facts.
The correct sentence is (A). In this example the author stablishes a good parallel structure when he/she enumerates the items. Commas must not be used in an independent clause; in particular, before a verb (the comma before “were” is not correct as an example B).
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Abarham Lincoln has been described.
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Thanks,
N111ANCY
