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What is the mistake on the third and why?

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Please answer this for me,,its for a test, the weirdo techer said we could do the test at home, which in my mind is, test=internet! anyway the weird question is... "This bag is made of polythene,which is an element made of carbon and hydrogen. Polythene is made from Crude oil,which is a renewable source. You can recycle this bag by taking it back to the shop and using it again"

Question: What is the mistake on the third and why?

so basically what is the mistake and why in this line: "You can recycle this bag by taking it back to the shop and using it again"??? Thanks!!! :) xx