Concept:The given features describe a mid-latitude grassland with a continental climate, limited rainfall, and tall grasses in humid areas. This matches the Steppes biome.
Explanation:The first point states that extensive mid-latitude grasslands lack trees and shrubs.
The Steppes, found in Central Asia and Eastern Europe, have a semi-arid climate that prevents tree growth.
The second point mentions hot summers, cold winters, and low rainfall mainly in spring and summer.
Steppes experience extreme temperature variations, with annual rainfall between 250–500 mm, mostly occurring in spring and summer.
The third point says in humid parts, grasses grow over a meter tall.
In the more humid zones of the Steppes, adequate soil moisture supports tall grass growth, while drier areas have shorter grass.
Other options do not fully match: Prairies receive more rainfall and have taller grasses; Savanna is tropical with scattered trees; Pampas have a milder climate and more rainfall.
Therefore, the grassland described is the Steppes.
Answer:A. Steppes