Which of the following best describes marshes?

Marshes are wetland areas that are primarily characterized by the dominance of herbaceous (non-woody) plants such as grasses, sedges, and reeds. This vegetation thrives in saturated conditions and is well adapted to the fluctuating water levels often found in marsh environments. The presence of water, both surface and subsurface, plays a critical role in the ecosystem of a marsh, providing the necessary conditions for these plants to flourish.

Options that suggest marshes are found in arid regions or are not associated with water directly contradict the fundamental nature of marsh ecosystems. Similarly, marshes do not typically contain primarily woody plants, as that characteristic would align more with other types of wetlands, such as swamps, where trees and shrubs are prevalent. Thus, the description identifying marshes as dominated by herbaceous plants accurately captures their defining features.