Which of these is the likely progenitor of a type I supernova?


#1

A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses
B) a contact binary, with the neutron star at 2.3 solar masses
C) an evolved red giant which is just starting to make silicon in its core
D) an evolved blue supergiant that is about to experience the helium flash
E) a helium-neon white dwarf


#2

A


#3

Awesome help, super fast!