The correct answer is: Any language taken directly from the source.
In a research paper, anything that is taken directly from a source should be placed inside quotation marks. This way, you are acknowledging that you cited some sources and these are not you're own words. It will help you avoid plagiarism as well.
Keats avoided forming dogmatic opinions.
☆True
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<span>D.) a difficult, but worthy endeavor</span>
A belief held by the transcendentalists is that "Man is a divine creature with good intentions"