Based on the given statement above, I can say that the type of comparison that is being shown is a SIMILE. A simile is a literary technique that compares two unlike objects with the use of the words "like" or "as...as". Apparently, this uses "as...as" in comparing "they" and "bark of a tree". Hope this helps.
Answer:
B)
Explanation:
The passage with the sentences from your question are missing and I cannot find them on the internet but I have found the correct answer which is B). Unfortunately, I cannot give you any explanation of it, but I hope that this will help you with your research.
I assume that the missing passage is about the environment and how people are treating it but I cannot give you any further information until you share the missing passage.