Final answer:
Mr. Brewster and his companions were being discreet by secretly arranging their departure to Amsterdam, rather than being careless, unwelcome, or greedy. The correct option from the list provided would be B) discreet.
Step-by-step explanation:
The passage describes a scenario in which Mr. Brewster and a few other landowners are arranging to leave their homes secretly to move to Amsterdam.
Given the context of their need to keep their departure quiet, the most fitting description of their behavior is 'discreet'. They are not being careless or unwelcome; rather, they are taking careful measures to ensure their plan remains undetected.
The correct option from the list provided would be B) discreet.