单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What do you think the speaker will talk about in the next part of his speech

A.The contributions the elderly can make to our societies.
B.The swelling burden of supporting welfare programs in the future.
C.Our responsibility of building retirement homes for our graying society.
D.Our responsibility of looking after the old family members by ourselves.