The correct answer is C) humid continental.
Mike Edwards was traveling by the climate zone known as humid continental.
The North European Plain in Russia has this kind of climate. In this zone of the country, we find mixed coniferous and deciduous forests due to the influence of the coniferous taiga, another climate zone in Russia. In the climate zone known as humid continental, the soil is kind of fertile and allows farmers to grow some crops with the help of agriculture techniques and fertilizers. That is why Mike Edwards wrote in “Playing by New Rules,” that "Train bored through a corridor of birch and pine interspersed every 15 minutes with a village. Each of these openings revealed, in the evening light, patches of cabbages, beets, onions, and tomatoes."