The Olive Branch Petition was a message that was sent to King George III sent by the Second Continental Congress to assure the king of their loyalty to him and to Great Britain but made it clear that their rights as Americans shall be free.
Since Russia had an alliance with Serbia, it ordered its forces to mobilize for war. it wasn't a formal alliance, but it did specify that if someone declared war on Serbia, Russia would also step in. This resulted in other countries also getting involved in the war. The answer would be D!
-TetraFish
If the yellow triangle is referring to the Star of David then the answer is B.