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#54407 Bangla Language & Literature General Level 0

নিচের কোনটি পানি দূষণের প্রাকৃতিক কারণ?

  1. A কারখানার বর্জ্য
  2. B কীটনাশক ব্যবহার
  3. C ভূগর্ভস্থ আর্সেনিক
  4. D ময়লা ও আবর্জনা
Answer: C - ভূগর্ভস্থ আর্সেনিক

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