whats the defrence between basic and plus I know the ads thing but I heard someone got robbed in plus

What effect did john hay’s open door policy letters have on the imperial powers of britain, france, germany, russia, and japan? a. it provoked the imperial powers to declare war on the united states. b. it caused the imperial powers to restrict trade in their trade with china. c. it warned the imperial powers that the united states would soon declare war on china. d. it signaled to those powers that the united states would take a larger role in world affairs than before.

What kind os source would a historian use to get a firsthand account of a past event

Due to serious dogmatic differences between the orthodox church and the western christan churches, the orthodox church is not in communion with the roman catholic and protestant communities true or false