Write a question about the following article.

Europe and Japan are said to be " dying from within " because of not enough population -- babies are not being born quickly enough to replace the current population and support the older folks . America has only escaped this dire fate do to immigration . ( Europe had immigration , too , but they are not integrating , so , apparently , it does n't " count .

Question:
Why is the populating declining in Japan ?

(A). There is a bunch of natural disasters .
(B). There is a negative birthrate .
(C). There is a bunch of immigration out of Japan and into Europe .
(D). There is a bunch of immigration out of it .