The type of database organization in which data are represented in rows and columns is called:
A. Network database
B. Relational database
C. Tree database
D. Hierarchical database
E. Hybrid database

B. Relational database

Explanation:
A relational database organizes data into tables with rows and columns, where each row represents a record and each column represents an attribute of the record. This structure allows for the use of SQL queries to access and manipulate data efficiently. Therefore, option B is the correct answer.