I think the answer would be C. Improving workers lives but leaving society's structure alone.
They have a shared interest in the issues.
The Allied strategy for winning World War II was they planned to retake North Africa to invade through Italy, invade France from Britain and Germany from the Soviet Union, and then combine forces to defeat Japan.
The answer is B) A series of actions by the Catholic Church intended to spread and defend the Catholic faith.
The counter-reformation was in response to the Protestant reformation, so the first answer is out of the question.
Martin Luthers own actions sparked the Protestant reformation, and as mentioned prior - it was a response to the Protestant reformation (however, during this time they did solidify the power of the pope).