In this case, the organization is interested in finding the most popular TV serial, which refers to identifying the value that appears most frequently in the data. This corresponds to the \(\textbf{mode}\), as the mode is the value that occurs most frequently in a dataset. The mean and median are not suitable measures for identifying the most popular option in this context. Hence, the preferred measure is \(\textbf{Mode}\).
The correct option is (B): Mode