These are ____ from other presses .They are having a meeting

These are ____ from other presses .They are having a meeting in one of the ___ office .
A.editor- in-chiefs ,editor’s-in-chief
B.editors –in –chief ,editors-in-chief’s
C.editors –in-chief’s ,editor’s –in-chief’s
D.editor-in-chief’s ,editors –in-chief