The example of challenge of marketing through online social networks is most existing networks are already controlled by major corporations and therefore do not favor competitors.
Marketingcan be described as the activity, set of institutions, and processes for creating, communicating, delivering, and exchanging offerings that have value for customers, as well as the society at large.
It should be noted that the Social media marketing which can be described as the digital marketing and e-marketing is the process of using of social media which can be described as the platforms on which users build social networks and share information and this can help[ the company's brand to be established and increase sales, and drive website traffic.
Therefore, option C is correct.
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