Some IELTS Writing Task 2 questions require you to think of the reason for something as well as coming up with solutions for it.
These questions are called Causes and Solution questions. They are also a type of two part question.
Here is an example of one.
Causes/Problem and Solution
Example: Crime rates tend to be higher in cities than in smaller towns. Explain some possible reasons for this problem and suggest some solutions.
For a real model answer that would get a Band 7 score in this Writing Task 2 question, just email email@example.com