When does a trellis pattern develop?
a. When the river channel follows the slope of the terrain.
b. When a river joined by its tributaries at approximately right angles
c. When a pattern develops on a strongly joined rocky terrain
d. When streams flow in a different direction from a central peak or dome like structure.

Hint:
The pattern of development of trellis is similar to the pattern of garden trellis that is used to grow vines. When the river flows through the valley, small tributaries of the other river join these rivers.


Complete solution:
The trellis pattern develops when a river joined by its tributaries at approximately right angles. When the sedimentary rocks are folded to various degree levels. The sedimentary rocks are formed by the collection of minerals and organic particles on the earth’s surface. Some of the important examples of the sedimentary rocks are Sandstones, limestone, and shale. There is a type of organic sedimentary rocks that are formed by the action of the organism.

The trellis drainage system is an important property of the folded mountains. One of the examples of the folded mountain is the Appalachian mountain of North America.

Additional Information – The folded mountains are formed by the movement of two or more tectonic plates. These mountains have a larger length than that of breadth. The movements by which the folded mountains are formed is called orogenic movements.


Hence, the correct answer is option B.

Note:
Some of the other drainage systems are Dendritic patter, Rectangular pattern, Parallel drainage, radial drainage, Centripetal drainage, Angular drainage, and deranged drainage. All these patterns are created by the stream erosion over time and also expose the geological structure of the area and region.