Answer:
The correct answer is letter "C": An infographic.
Explanation:
Content marketing is a technique that consists in creating content inside an individual's web page on social media so that it attracts different segments of our target consumers so they can become clients. Content marketing can include articles, webinars, videos, personalized e-mails, or blogs.
Infographics do not fall in this category since they are just graphic representations to portrait written texts, not necessarily with marketing purposes.