The correct answer is C. All people have negotiation skills; they just need to know how to use them effectively (Fisher & Ury, 2011)
Explanation:
Paraphrasing means expressing ideas that are not your own but using own words. This is a form of including external sources and requires citation to avoid plagiarism. Moreover, as part of the citation, it is necessary to include the last name of the author and the year. This can be done either by including this information at the end of the citation in a parenthesis or by mentioning the author during the text and then including the year in parenthesis.
From the options presented, the only one that meets this criteria is "All people have negotiation skills; they just need to know how to use them effectively (Fisher & Ury, 2011)" because the last names of the authors and year is included at the end as it is recommended.