The Allied countries and empires that constituted the Central Power during the First World War were Austro-Hungary, the German Empire, the Ottoman Empire and Bulgaria which is known as the Quadruple Alliance. Although the alliance was nominally joined by Italy, it did not participate in the First World War on the side of the central powers, while the Ottoman Empire and Bulgaria joined the very beginning of the war, while the alliance, Austro-Hungary and Germany existed before.
According to the options offered, the answer is: Austro-Hungary, the German Empire, and the Ottoman Empire.
