I think the best answer is C or D. Don't take it from me though.
It is called plate techtonics
The most suitable word for Barcelona would be "enthusiastic". The word enthusiastic comes from the word itself which is "enthusiasm" that means a feeling of energetic interest in a particular subject or activity and a desire to be involved with it. For Barcelona, when you imagine the place, you ought to be interested in what's with the place and what does the place offer.
Answer:
at that time cast differentiation was purely based on the work people did rather than what their answers used it so you could very easily change your cast so having the cast system helped develop the city tell it to plays and it was easier for people to know who is doing one kind of help to build up
