How did Lewis Powell get into Seward's home on this evening?
A) he posed as a doctor
C.) he posed as a messenger carrying medicine
B.) he snuck in
D.) he shot his way in using his gun

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.

they died because of a disease during the first spanish colonies.

a drastic rise in oil prices ended decades of postwar.

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know