Answer:
2,4,5
Explanation:
A simile compares 2 things using like or as. Examples such as "stood out like a sore thumb" compare something (Sanjay) with something completely unlike the first (a sore thumb) connecting the two with like or as. Use this when looking for a simile in the future.
It means that they are not essential( needed) because they rarely show anything that we have no knowledge about and that we can't solve them easily.
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The answer seems to be indeed A