Both stories praise the ideal of family and express idea of inportance of a family in people's lifes and. So, The authors of Desert Exile and The Way to Rainy Mountain both express idea C. Family is more important than country. Problem of family vs country is very common, and those authors develop it during the whole story.
the grammatical name of the novel things fall apart.
It would be all of the above except for the medium of publication.
Hope I helped :)