What is the building in the picture below? And where is it located?【图片】
A.
The Collosseum(罗马斗兽场), in Rome, Italy
B.
Cathedral of Saint Mary of the Flower(圣母百花大教堂), in Florence, Italy
C.
Milan Catherdral(米兰大教堂), in Milan, Italy
D.
Leaning Tower(比萨斜塔), in Pisa, Italy