What characterizes a "one-length" haircut?

A "one-length" haircut is characterized by all strands being cut to the same length. This technique creates a uniform appearance, giving the hair a solid and consistent foundation without any layers. This style is especially popular for its ability to add weight and fullness to the hair, making it suitable for a variety of hair types and textures. The simplicity of the cut can provide a polished look, and it allows for easy maintenance, as the style does not involve layers that require regular trimming to maintain their shape.

In contrast, the other options describe different haircutting techniques. Cutting strands to different lengths involves layering or texturizing the hair, which is not indicative of a one-length cut. Layering hair for volume would also imply the presence of varying lengths to create movement and shape, deviating from the one-length principle. Similarly, styling hair with extreme angles suggests a more choppy or tapered appearance, which again indicates a departure from uniformity. Thus, option B accurately reflects the defining characteristic of a one-length haircut.