The discussion of the means by which GHBs escape black holes that is offered in the second

A. The light emissions from GHBs always degrade from gamma rays to x-rays to visible light and, finally, to radio waves.
B. Particles in GHBs include not only photons but electrons and their antimatter counterpart, positrons.
C. The expansion of a fireball as it moves away from the black hole lowers photon density.
D. Shock waves almost always form. at the boundary between the fireball and the external medium.
E. The timescale by which we witness astronomical phenomenon is always ruled by the principles of relativity.