what parts of europe still has an agricultural economy in the early twentieth century

Answer 1

Most of it.

Agriculture was important even in the industrialized areas.

Answer 2

I'm not sure quite what the question means. Certainly Ms. Sue is correct. Agriculture is still very important even in the 21st century. Some areas of Europe were less industrialized than others in the 20th century. One might point to Romania, Albania, and some other areas in the Balkans. But we have no idea what your text materials say or what will be considered a "correct" answer.