The answer is A. As those are the two diplomats who signed it. Molotov is the Soviet, and Ribbentrop the German.
Depends on what time period your referring to but i believe this is The Mandate Of Heaven.
C
The germans had to concede many of their territories and had to pay for the damage caused by the war they created as payment for their action.
I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.