Refer to the graph shown depicting a monopolistically competitive firm. The marginal revenue curve is represented by curve: 
Definitions:
Word-Of-Mouth Advertising
A marketing method through which information about products or services is passed from one person to another through oral communication.
Viral Marketing
A marketing strategy that focuses on spreading information and opinions about a product or service from person to person, especially by leveraging networks and social media.
Expert Ratings
Assessments or evaluations made by individuals with specialized knowledge or expertise in a particular area.
Metacritic
A website that aggregates reviews of media products like games, music, television shows, and movies, providing an overall score.
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