Answer: numbering
It makes the most sense because bullets just lists things. Bold word emphasizes things. Subheadings are just titles so numbering makes the most sense.
Simile uses like or as to compare and contrast two different objects, while an analogy compares two objects by comparing them too other objects. An example of a Simile includes "The Pan was as hot as the Sun" and an example of an analogy includes Puddle - Ocean and Pile of Rocks/Gravel - Mountain.
Hope this helps! Tried my best. If it does may I have brainliest! :) Thanks!