Answer: D or C both works
This number would greatly increase, as there are many nations that don't have their own their own country. Some are part of a bigger country (the Tamils in India) and some are distributed among many countries (the Kurds)
Recognizing all those nations could increase some conflicts, such as that between the Kurds and Turkish in Turkey.
I think that a good definition should acknowledge that some nations have independent states and some are part of another state - the defining characteristics should be a sense of unity among the nation.
The women who are more likely to remarry are young mothers and those with no high school.
Young mothers often feel intimidated by having to take care of their children on their own, which is why they often unconsciously seek help from their partners, and start relying on them so much that it is easier for them to just get married again. The same thing goes for those with no high school - often they will want to marry someone who will take care of them.