Final answer:
Sinuosity refers to the amount that a river or stream channel curves in a given length. The correct option is c.
Step-by-step explanation:
Sinuosity refers to the amount that a river or stream channel curves in a given length. It is a measure of how meandering or winding a river or stream is as it flows from its source to its mouth.
The concept of sinuosity is related to the geomorphological characteristics of a river, which include meandering--the tendency to scour the outer bend of a river channel and deposit sediment on the inner bend.
This is often seen in slower-moving parts of a river where sediments accumulate, leading to more pronounced curves and bends in the river's path. The correct option is c.