What did russia do in response to austria declaring war on serbia?
how did it affect germany?

answer: in response to austria's declaration of war, russia, serbia's ally, began moving its army toward russian-austrian border. expecting german to join austria, russia also mobilized along to german border. the german, russia's mobilization amounted to a declaration of war. on august 1, the german government declared war on russia

answer; i believe that the correct answer is (d); //declaration of independence; plz check first good luck

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.