Questions 11 to i3 are based on the following passage. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the passage. Why the amount of rubbish needs to be reduced
A．Because rubbish can be recycled. B．Because there is not enough space to dump rubbish. C．Because rubbish can only be collected from our doorstop. D．Because rubbish needs to be placed at a bottle bank.