Choose the best topic sentence from the four options below. Write the corresponding letter of your choice on the answer sheet.
A、American adults aged 50 and older say reducing crime is one of the policy priorities.
B、Seventy-seven percent of younger Americans prioritize protecting the environment.
C、Both younger and older Americans place a much lower priority on climate change.
D、The policy priorities of younger and older Americans differ in three key respects.
【正确答案】：D
