Answer: Option (a) is the correct answer.
Explanation:
Oxbows means that formation of a loop like a horseshoe bend in a river or it could be like a U-shaped letter.
For example, U-shaped bodies on the side of a river represent an oxbow.
When oxbows are closely monitored then it tells about the actual condition of the river.
Therefore, we can conclude that out of the given options water is the medium which creates oxbows.
