How Does a Prairie Grass Access Water During a Drought

How does a prairie grass access water during a drought?

A) It has many shallow roots covering a large area to reach nearby rivers or streams.
B) It has long deep roots allowing it to reach water supplies.
C) It has long deep roots to hold the soil in place, thus producing a more porous soil.
D) It stays shorter in a drought, thus not losing as much water through transpiration.
E) Grasses are not adapted to drought, so they usually die.