Why Does Japan and South Korea Import So Much Meat

Why does Japan and South Korea import so much meat, wheat, lumber and pulp?

A) Communist rule influences what these countries can produce.
B) These countries have limited space to produce these products so must import them.
C) There are not enough trees to provide lumber.
D) Much of the population of both countries is vegetarian.
E) Local climates prohibit the agricultural production of these products.