The correct answer is - C) Denmark and southern Sweden.
Scandinavia, in general, is not a region that is the best for farming, and the main reasons for that are the climate and the relief. Still, parts of it, because of the influence of the Gulf Stream can be relatively productive, though only for certain plants.
Denmark is almost entirely suitable for farming, and the reason for that is because it is a little peninsula with multiple islands, all under a big influence of the Gulf Stream and also the elevation is incredibly low.
The southern parts of Sweden as well can be used for farming, because the soil is fertile, the Gulf Stream is very influential, and its elevation is too very low. The inner part of the country though is not suitable for farming at all because the temperatures are more extreme and also the elevation increases, with the Gulf Stream also not being able to influence it.
