Final answer:
The figure best illustrates erosional landforms, as it describes very young gullies on Mars that resemble those carved by flowing water, indicating recent erosional activity likely caused by sporadic liquid water flows.
Step-by-step explanation:
The description suggests the presence of very young erosional features that resemble gullies formed by the action of flowing water. These gullies lack impact craters and sometimes intersect with wind-deposited dunes, hinting at their recent origin. Furthermore, the existence of underground liquid water is hypothesized, which may sporadically emerge to create brief surface flows. Taking these observations into account, the figure you referenced would best illustrate erosional landforms.
The mention of karst landscapes, such as the Stone Forest in Yunnan Province, China, involves landscapes shaped by the dissolution of soluble rocks like limestone, forming features like caves, sinkholes, and pinnacles. This process is distinct from the erosional gullies mentioned earlier.
When discussing glaciation and glacial features, the focus would be on the landforms created by the movement of glaciers such as moraines, eskers, and cirques, which are not described in the provided information. Similarly, coastal deposition involves sediment laid down by oceanic processes, which would lead to features like beaches and barrier islands.
Considering the given descriptions, the erosional features on Mars resembling gullies without any superimposed impact craters and intersecting with wind-deposited dunes best illustrate erosional landforms. These features were likely recently formed, possibly due to the subsurface breakout of liquid water.