The Western Siberian Plain is marshy in some places because it has poor natural draining systems.
A Drainage system may be defined as the complete process to exhaust the water in the soil to improve crop production in an area. It eliminates the water through the surface of the earth.
The complete question is as follows:
The Western Siberian Plain is __________ in some places because it has poor natural draining systems.
Therefore, the correct option for this question is C, i.e. marshy.
To learn more about the Drainage system, refer to the link:
https://brainly.com/question/908462
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