Answer: B) Simile.
Explanation: A simile is a figure of speech that consists in making a comparison between elements that aren't obviously related, this comparison is made using the words "like" and "as." In the given passage we can see an example of a simile in the phrase "he was as brittle as a bamboo before it bursts into a flame" it is comparing a person to a bamboo using the word "as." So, the correct answer is option B.