To analyze the geologic processes that could have formed the channel on Mars, I would select the image of a landform formed by flowing water. This image showcases features such as meandering patterns and sediment deposition that are characteristic of river channels on Earth. These characteristics closely resemble the channel observed on Mars, suggesting that a similar process involving the movement of water may have been at play in the Martian environment.
Based on this analysis, I think the channel on Mars was formed by flowing water. The presence of branched channels and sedimentary features seen in the image I selected supports this conclusion, as these are typical indicators of erosion and sediment transport associated with water flow. Furthermore, several studies have indicated that Mars once had liquid water on its surface, making it plausible that flowing water could have carved the observed channel over time.