The bending of light from the core (edge) of a barrier is called diffraction, which corresponds to option [B]. Diffraction occurs when a wave encounters an obstacle or a slit that is comparable in size to its wavelength, causing the wave to bend around the edges and spread out. This phenomenon is a fundamental aspect of wave behavior and can be observed with various types of waves, including light and sound. In the context of light, diffraction can create patterns of constructive and destructive interference, leading to effects such as the rainbow-like colors seen in a CD or the spreading of light when it passes through a small aperture. Unlike dispersion, refraction, and interference, diffraction specifically describes the bending and spreading of waves around obstacles.