Although Neutron Stars Are Very Hot, They Are Faint and Not

Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because

A) light does not escape from their event horizon.
B) most lie beyond dense dust clouds.
C) they have only a small surface area from which to emit.
D) the peak of their thermal emission is at much shorter wavelengths than visual.
E) they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.