The study from the Teacher Training College in Bilbao Spain shows that______.A．some people

The study from the Teacher Training College in Bilbao Spain shows that______.

A．some people were much wiser when they were young

B．climate change is a subject that affects every member of human society

C．climate change is the greatest hoax to people from all over the world

D．people pay less attention to the environment when they become older

请帮忙给出正确答案和分析，谢谢！