One of the benefits of the european union is that citizens within the union only need a unified passport, which makes travel between countries easier. what problem could this cause the individual countries? a) other countries may not accept the unified passport and allow them entry into the other nations. b) the other countries could lose jobs and economic opportunites because they will not have enough jobs to go around. c) citizens of the european union could become victims of identity problems because of cyber threats in other countries. d) citizens of the european union could begin to think of themselves as european instead of citizens of their own country.