Which of the following details is MOST important to the development of the MAIN idea?

A
Every school-based employee, from principal to cafeteria worker, is to receive instruction in everything from what information to release if immigration agents arrive at a school (none) to how to communicate with parents who speak another language.
B
Pittsburgh’s school system declared itself a sanctuary district, but that designation was symbolic, and a spokeswoman said it had no immigrant-rights training sessions planned.
C
He landed at Furness, where he learned the language and began to feel he belonged, despite the challenges of adjusting to life in a new country.
D
More than half of Furness’ immigrant students are refugees with documentation, which allows them to apply for college financial aid and receive other government supports.