Final answer:
Option E is correct, confirming that all statements are true: Entities are information units, Events denote business activities, diamonds represent relationships in data modeling, and E-R diagrams universally apply.
Step-by-step explanation:
The correct statement(s) is(are): E. All of the above are true.
Option A is true because an entity is anything about which the organization wants to collect and store information.
Option B is true because events are various business activities about which management wants to collect information for planning or control purposes.
Option C is true because some data modelers, tools, and authors use diamonds to depict relationships in data modeling.
Option D is true because E-R diagrams can be used to represent the contents of any kind of database.