D. Henry Ford adapted the assembly line, an innovation in factory production, to produce cars.
Letter D because it starts with “In Conclusion”. I am assuming that number 3 is the last sentence in the paragraph.
Answer:
Social media marketing is any social media action you take that is unpaid. If you're posting about your blogs, sharing info with your followers, or commenting in social media groups, you're marketing. Social media advertising is any action you take on social media that is paid
