Points labeled A are called data set. Point labeled B is called the outlier. The outlier is a point that does not fit well with the rest of our data set. Possible reason for point B is that someone is super smart and they don't need to spend a lot of time studying to achieve good results.
We can see from the graph that the number of hours spent on social media and test scores is negatively correlated. In other words, the more hours you spend on social media the lower your test scores should be.