Explanation:

• River capture, also known as stream piracy, is a geological phenomenon that occurs when one river or stream diverts the flow of another river, causing it to change its course and drainage pattern. o This process typically happens over a geological timescale and is driven by various factors, including differential erosion, changes in topography, and the relative discharge and erosional power of the rivers involved. • River capture often occurs when one river has a higher discharge and erosional power than another. This can be due to differences in the type of bedrock, sediment load, or the gradient of the river. o The more erosive river can gradually wear away the landscape, creating a path through which it can divert the flow of the weaker river. • Changes in the landscape, such as the uplift of mountains or the formation of geological faults, can alter the natural drainage patterns of rivers. These changes can create opportunities for one river to capture the flow of another. • As erosion continues, the capturing river may develop a new channel that intersects with the course of the weaker river. When this happens, the capturing river begins to divert water and sediment from the weaker river.  Over time, the captured river may erode its new channel more efficiently, causing the weaker river to lose water and eventually become a small tributary of the capturing river. This results in a change in the drainage pattern of the region. • One famous example of river capture is the "Horseshoe Bend" on the Colorado River in the United States. The Colorado River captured the flow of a smaller tributary, gradually eroding through the landscape to create the horseshoe-shaped bend that we see today. • Hence option (b) is the correct answer.