Final answer:
The main idea of the given text, concerning plastic, is best represented by the sentence: 'Plastic has both unique properties and resistance to deterioration.'
Step-by-step explanation:
The question requests to identify the sentence that best represents the main idea of an unspecified text in relation to plastic. From the provided options, the sentence 'Plastic has both unique properties and resistance to deterioration.' (option d) closely sums up a main idea about plastic, covering two aspects: its unique properties and its resistance to deterioration. It combines aspects from all the other options, making it the most comprehensive choice.
Learn more about Main Idea