Which region is russia’s most valuable to farmers?

Land that is near/at the center of Russia but lower in the center because the south have more heat than the north

Tundra refers to the generally cold climate of the Earth’s northern hemisphere. ‘ Areas that have a tundra climate have average temperatures of lower than 5 degrees Celsius. ‘ Characteristic of tundra climate is the soil condition called “permafrost”. ‘ This condition literally means that the soil is permanently in frost mode. ‘ This condition makes it a very harsh environment for various plant and animal species.

Answerincreases;

The answer would be  b. hope this !