Answer :
Final answer:
The sentence should be inserted before sentence C as a call to action for individuals to reject disposable plastics.
Explanation:
The correct location to insert the sentence 'It is now up to individuals to reject disposable plastics, even if it is a little less convenient for themselves.' within the passage is before sentence C. This sentence serves as a call to action for individuals to take responsibility for reducing plastic waste and introduces the idea of rejecting disposable plastics before providing examples of alternatives.
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