Respuesta :
It is not at all a difficult answer, as the point can be easily understood after one has gone through "Tokyo". In "Tokyo," Ryo and Tsuruishi have all of the following in common except that they both have children. The correct option among all the options that are given in the question is the first option and i hope that this helps you.
I believe the answer is: they both have children
In the story, only Ryo has children while Tsuruishi doesn't have any. The story depict a story about the struggle of ryo the world war period. Her husband went missing because he was captured in Siberia and Japan was experiencing massive recession due to the war.