The answer is b, the Battle of Britain was the RAF (Britian) defending themselves from the Luftwaffe (Germany).
The correct answer is B. Roman Catholic Church
Both sides were Christian churches but the Eastern one based around Byzantium was Orthodox while the Western one based around Rome and Pope was the Roman Catholic church. They still exist today except that the Orthodox church is not unified by a single leader and countries that practice Orthodox Christianity each have their own religious leader.
I think it would be C. Most states participate in blanket primaries for elections.
The answer is: D) He placed family members in charge of regions
In order for the Zhou king to bring the vast regions of the east to the centralized government of the Zhou Dynasty, it was of the utmost importance to place members of the royal family into places of authority and also establish kinship ties via marriage to unify the regions it was looking to control.