The battle of the Marne was a major turning point of World War I. By the end of August 1914, the whole Allied army on the Western Front had been forced into a general retreat back towards Paris. Meanwhile the two main German armies continued through France.
"bi" means 2: so bi-cameral means with two "cameras" - two chambers, answer B!
a legislative body with only one chamber would be called uni-cameral: "uni" meaning "1", or "unique"
He was known as the common man because he didnt grow up rich and privileged like the other presidents. Common people thought he was like them