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C. a proverb
A proverb is a short staying that tells a universal truth or advice. This proverb is saying that a true friend is one that it there for you in times of need, not just in good times.
An adage is very similar to a proverb. In fact, they can be used interchangeably. Generally an adage is something that is a saying that is very old. Often proverbs are seen as words of advice and an adage as a statement of truth.
A simile is a comparison between two things using like or as.
An idiom is a phrase that does not mean what it says. For example, "raining cats and dogs" is an idiom. This does not mean that cats and dogs are raining down on the earth. It means that the rain is very heavy.
If I was the writer, standing in the shoes of an elephant, I'd start off describing my peaceful life. I'd describe how we were peaceful mammals. We (Meaning the elephant and his elephant friends and family) always went about our business and did what was needed to live. Poachers came to hunt us down quite often, just because our skin was considered rare amongst the African People, they would kill us. Describe how the semi humane people would not kill the elephant, but buy the skin from the seller. These killers, the poachers often resurfaced as wealthy, heartless men. Although most people consider it a "small issue" it is killing us, we are drifting to extinction if this doesn't stop, and soon. Write about how you think life might be, if poachers were not a thing.
I am pretty sure that if you embellish upon this story and extent it enough. This will surely meet your story's character standard of 300-500 characters.
-Hope this helped
Sincerely,
xPain