Answer:
a. social media monitoring
Step-by-step explanation:
Social media monitoring is the way in which information can be obtained about the response of the general public to a product by using social media measurement and analytics to extract insights from online media such as blogs, news sites, and so on.
In the given scenario Mentionlytics are using social media monitoring when they use powerful social analytics and mention analytics insights to gather information about what customers are saying about the companies that they use for goods and services.