If your options are:
A. They will not resume their marriage, and Penelope will resent Odysseus for being gone so long.
B. They will not resume their marriage, but Penelope will help Odysseus defeat the suitors.
C. They will resume their marriage, but they will feel estranged because of their long time apart.
D. They will resume their marriage, and they will happily rule together over their kingdom.
The answer is D. They will resume their marriage, and they will happily rule together over their kingdom. The Book 23 made it clear that the reunion between the two spouses is not only possible but certain. Sure, Odysseus is back, but Penelope isn't certain that their marriage can be revived until he passes her test. When she tells him that he will sleep outside her room, he reveals that he remembers their bedroom, which was built around a giant olive tree. Thereby he shows his wife that he hasn't forgotten their first nights together, from 20 years ago. It means there are no obstacles for the two of them to resume their married life and happiness.