What aspect of a trellis pattern identifies it from other patterns?

A trellis pattern is characterized by its distinctive resemblance to a garden trellis, which is where it derives its name. This drainage pattern consists of a series of interconnected streams that create a grid-like or lattice framework. This structure arises from the differential erosion of the underlying geology, leading to parallel streams forming in one direction while tributaries flow in a perpendicular fashion. As a result, the overall appearance closely imitates a trellis used in gardening, thus making option B the most accurate representation of what defines a trellis drainage pattern.

Other aspects, such as alignment with geological fault lines, might occur in various drainage patterns but aren't exclusive to the trellis type. Similarly, the trellis pattern does not require perfectly flat land for its formation, as it can occur in uneven terrain where streams adjust to the underlying rock structure. Additionally, while trellis patterns can be found in urban areas, their prevalence is not a defining feature and is not inherent to the pattern itself, as they can be present in natural landscapes as well.