To determine the best description of the author's overall purpose, we would need more context about the article. However, based on the options provided, the most suitable choice appears to be:
B. to encourage readers to set aside social media and live in the moment.
This option suggests a broader theme of being present and engaged in real-life experiences rather than being distracted by technology, which aligns with a common purpose in articles that critique social media use. If further context from the article indicates a different focus, the correct answer may vary.