Answer:
B). According to Swift, he has "not the least personal interest in endeavouring to promote this necessary work."
Step-by-step explanation:
Quotations are most likely employed by the authors either to mark the exact language of a source or to highlight/underline a particular idea or thought in order to emphasize it or make it notable.
In the given question, option B displays the statement that most effectively employs a quotation as it represents the exact words or language of Swift that substantiates the point that 'he has no intent to serve his personal motive through this proposal'. The other options are incorrect as they either paraphrase Swift's idea(option C) that could offer adulterated information or does not employ the quotation marks(options A and D) which has chances of inclusion of author's personal opinions. Thus, option B is the correct answer.