What was Built using European ideas

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Explanation:

"Europe" as a cultural sphere is first used during the Carolingian dynasty to encompass the Latin Church (as opposed to Eastern Orthodoxy). Military unions of "European powers" in the medieval and early modern period were directed against the threat of Islamic expansion. Thus, in the wake of the Fall of Constantinople to the Turks in 1453, George of Podebrady, a Hussite king of Bohemia, proposed in 1464 a union of European, Christian nations against the Turks.

In 1693, William Penn looked at the devastation of war in Europe and wrote of a "European dyet, or parliament", to prevent further war, without further defining how such an institution would fit into the political reality of Europe at the time.

In 1728, Abbot Charles de Saint-Pierre proposed the creation of a European league of 18 sovereign states, with common treasury, no borders and an economic union. After the American Revolutionary War the vision of a United States of Europe, similar to the United States of America, was shared by a few prominent Europeans, notably the Marquis de Lafayette and Tadeusz Kościuszko.

Some suggestion of a European union can be inferred from Immanuel Kant's 1795 proposal for an "eternal peace congress".

d is the answer. leo should include the source.

your answer would be (a)