Why Is the Electron Not Likely to Be Found at the Nucleus

Why is the electron not likely to be found at the nucleus?

A) The atom cannot emit enough energy to allow the electron to fall to such a low-energy state.
B) As electrons approach the nucleus, they radiate energy and annihilate themselves.
C) The electron is traveling too fast to approach the nucleus.
D) The electron is repelled by the strong nuclear force.
E) The volumes of the spherical shells very close to the nucleus are exceedingly small.