Final answer:
Using the given constraints, it is determined that the second event to be organized is D, since E cannot be first or second due to its required position before C, and B must follow D without being the first event.
Step-by-step explanation:
To determine which is the second event to be organized, we must use the constraints given:
- E should be immediately followed by C.
- B should be organized immediately after D.
- One event is organized between A and B.
- D or E should not be the first or last event.
Based on the constraints, E cannot be first, and since E must be followed by C, E cannot be second either, because then C would have to be third, leaving no spot for D to be before B. Since D cannot be last, and B cannot be first (because it must follow D), the arrangement must be:
- First event: A
- Second event: D
- Third event: B
- Fourth event: E
- Fifth event: C
Therefore, the second event to be organized is D.