The answer is A, C & D make no sense. B is not wrong, but A is the better answer.
Answer:
When Austria-Hungary declared war on Serbia, it led to Russia declaring war on Austria-Hungary as well because Russia was in an alliance with Serbia.
Germany which had an alliance with Austria-Hungary via the Triple Alliance then declared war on Russia.
Russia was already in an alliance with Great Britain and France known as the Triple Entente and when Germany declared war on Russia, Great Britain and France declared war on Germany.
Thus began the Great War.
The significance of the Battle of Bunker Hill was that it showed the determination of the outnumbered American forces. Although the colonial forces were defeated their ability to inflict damages and heavy losses on the British was an important factor in increasing the support for the colonists military efforts.
He was the Prime minister in Britian during WWI and WWII. He was trusted because he stayed true to his values and was pro-american
