"Which of the following is the best description of the interior structure of a highly evolved high-mass star late in its lifetime but before the collapse of its iron core?" code example

Example: "Which of the following is the best description of the interior structure of a highly evolved high-mass star late in its lifetime but before the collapse of its iron core?"

An onion-like set of layers forms, with the heaviest elements in the innermost shells surrounded by progressively lighter ones.