In which year did Italy and Bulgaria enter the war?

A1914
B1915
C1916
D1917

Which of the following correctly lists the alliances that fell into place after the assassination of Archduke Francis Ferdinand and his wife, Duchess Sofia?

AAustria-Hungary, Germany and the Ottoman Empire versus Serbia, Russia, France and Great Britain
BAustria-Hungary, the Ottoman Empire and Serbia versus France, Germany, Russia and Great Britain
CSerbia, France, and Russia versus ...