The first step I would take would be figuring out what city I want to eat migrate to. For example, if I was immigrating to Berlin, Germany I would take the following steps:
1) Find a part of the city where there are job opportunities that I am qualified/interested in.
2) Request to migrate to that country for work and obtain access to immigrate from the government of the country I currently reside in.
3) Find a way of transportation to that country
4) make sure I have relatives or friends in that city I am moving to
5) Visit beforehand and become familiar with my surroundings
6) Visit places where I would be interested to work in and visit places where I am interested to live in so I am prepared.
7) After that I would plan the final trip and complete my migration
Your answer is B., because it is unidentifiable, so if they don't know the source, then why cite it right? :P :D So anyways, that's why your answer is B. =) I hope I helped! =D
