The Theory That the Collapse of a Massive Star's Iron

The theory that the collapse of a massive star's iron core produces neutrinos was supported by

A) the size and structure of the Crab nebula.
B) laboratory measurements of the mass of the neutrino.
C) calculation of models of core collapse.
D) underground counts from solar neutrinos.
E) the detection of neutrinos from the supernova of 1987.