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निम्नलिखित में से कौन सा विकल्प इस पाठ को पूरा करता है ताकि यह मानक अंग्रेजी के व्याकरण नियमों के अनुकूल हो? Public-awareness campaigns about the need to reduce single-use plastics can be successful, says researcher Kim Borg of Monash University in Australia, when these campaigns give consumers a choice: for example, Japan achieved a 40 percent reduction in plastic-bag use after cashiers were instructed to ask customers whether ______ wanted a bag.