Which of the Following Statements Apply in the Final Moments

Which of the following statements apply in the final moments of the life of high-mass stars?

A) Their outer layer is mainly hydrogen and helium.
B) Around their cores, they have a series of nested shells, each made of a heavier element than the one surrounding it.
C) They have iron cores.
D) The core temperature is about 2 billion degrees.
E) All of these choices are correct.