The Fact That Most $\alpha$ Emitters Show a Group of Discrete $\alpha$

Multiple Choice

The fact that most $\alpha$ emitters show a group of discrete $\alpha$ -particle energies,rather than a single energy,can best be explained by which of the following?

A) $\alpha$ particles and $\beta$ particles are emitted from the same unstable nucleus,and because the $\beta$ particles exhibit discrete energies,so must the $\alpha$ particles.
B) The parent can decay by $\alpha$ emission to any one of a number of allowed energy states of the daughter.
C) An $\alpha$ -emitting parent normally decays to many different daughter elements.
D) $\alpha$ emission is accompanied by neutrino emission.
E) Varying amounts of energy are required to tunnel through the nuclear potential well.