The correct answer is B.
The tortuosity of a meandering river is always less than 1. This is because the river’s path is longer than the straight line distance between its source and mouth. The tortuosity is a measure of how much the river meanders, and it is calculated by dividing the river’s length by the straight line distance between its source and mouth.
Option A is incorrect because the tortuosity of a meandering river is always less than 1.
Option C is incorrect because the tortuosity of a meandering river is always less than 1.
Option D is incorrect because the tortuosity of a meandering river is always less than 1.