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Mainly because the other answers don’t go well together with the statement
Human expansion, Hunting and increased poaching.
BOOM
Hope this helps :)
Explanation:
waterfalls are temporary features of rivers because stream erosion is greatest at waterfalls and rapids. The water that falls at the base of the waterfall erodes rock there, leaving the rock at the tops of the waterfalls to overhang. Overall, undermining causes waterfalls to recede farther upstream.
I think the answer is d not a 100 % sure