To determine the best answer, we would need to analyze paragraph 11 to see how the author portrays self-promotion through social media applications. However, based solely on the options provided without the actual text, the best choice seems to align with the overall context of self-promotion and its implications.
Given that the four options focus on aspects of self-promotion—such as time spent online, feedback types, negative comments, and the modification of one’s online presence—option D, "It encourages users to modify how they present themselves online in order to gain positive reactions," would likely best capture a more comprehensive view of the author’s perspective, assuming the paragraph discusses self-promotion in light of seeking validation and changing behavior for social media engagement.
Therefore, the most fitting answer would be:
D. It encourages users to modify how they present themselves online in order to gain positive reactions.