Well, I believe it is c, but it might also be d
I believe that the answer is A because after a transitional phrase you add a comma. Sorry if this is incorrect.
~○●Sarah
Answer:
So I would say A but forgive me if im wrong
Explanation: An embargo is usually created as a result of unfavorable political or economic circumstances between nations. It is designed to isolate a country and create difficulties for its governing body, forcing it to act on the issue that led to the embargo.