The river is europe’s longest river. a. ob b. volga c. lena d. danube

B. Volga

Explanation:

The Volga River is the longest river in Europe. It is also the largest river in the continent when it comes to discharge and drainage. This river can be found in Russia, and it connects the south and the north, as well as the west to the east, effectively connecting Asia to Europe. Because of this, the Volga is of extreme historical and cultural importance. Moreover, it has played an important role in the development of Russia, as eleven of the twenty largest cities in the country are located in the Volga's drainage basin.

east-west schism. the greatest effect of the east-west schism was the creation of two separate churches that had previously been unified under one church, the eastern orthodox church and the roman catholic church.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: