Astronomy Review Question- Help needed?

Question

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.

Answer 1

it has to be (e) because the crab nebula has nothing to do with black holes and they've made lots of models but they sometimes don't work out. Everything else can only be circumstantial which circumstance is not proof.

Answer 2

I'll buy (e)