What was the name of the defense built between luxembourg and switzerland along the border between france and germany, which was constructed to protect the area the french believed most vulnerable to german attack?
a) the maginot line
b) the luxembourg defense
c) the vichy line
d) the ruhr defense

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: