有人能帮我吗？gwd-7-29

Q29:

A leading figure in the Scottish enlightenment,  Adam Smith’s two major books are to democratic capitalism what Marx’s Das Kapital is to socialism.

1. Adam Smith’s two major books are to democratic capitalism what
2. Adam Smith’s two major books are to democratic capitalism like
3. Adam Smith’s two major books are to democratic capitalism just as
4. Adam Smith wrote two major books that are to democratic capitalism similar to
5. Adam Smith wrote two major books that are to democratic capitalism what

如果没错我的答案是D，可是正确答案是E,大牛们怎么做的呢 ？

这是个句型A be to B what C be to D