The correct answer is: Looping.
Looping is a pre-writing technique we can use, for example, when we try to write an essay or presentation. Looping is often used by beginners who don't know how to start putting their thoughts and ideas into words. For this reason, some novice writers start with a free writing style (that is, writing, without any interruption, all the ideas that come to their minds) and then, with the looping technique, they choose the ideas that they want to include in their work; that is, they narrow their options in order to start writing.
Hexagonal writing, on the other hand, is a technique that writers generally use to explore the pros and cons of their ideas, and this does not necessarily include narrowing them.
The same happens with the option "compiling a list." Compiling a list is used to put your ideas in a list, or bullet points, but this, also, does not necessarily include narrowing the writers' ideas (probably you can write this list using the free style technique and then you can use the looping technique to narrow this ideas in order to start writing).
