Why was amiens cathedral such an important building?
a. it was the last gothic style cathedral ever built.
b. it housed the relics of saint john the baptist.
c. it contained the first example of a rose window.
d. all of the above?

Option D, all of the above, because it is a cathedral of Gothic style very important, and unique in its style, there they housed relics of San Juan the Baptist and contained gothic decorations with rosette in the architectural details. It was a very transcendent work in the history of architecture and in the development of Gothic art and the development of the temple as part of religion.