Final answer:
Saint-Denis Basilica is considered the first example of a Gothic building, having inspired the Gothic architectural movement in the 12th century with its innovative design.
Step-by-step explanation:
The first example of a Gothic building is C. Saint-Denis Basilica. This church, located in France, is historically recognized for initiating the iconic Gothic style of architecture. Its development in the 12th century under Abbot Suger introduced revolutionary structural elements such as high vaulted ceilings, extensive use of stained glass, and the pointed arches that are characteristic of Gothic architecture, thereby inspiring subsequent Gothic cathedrals across Europe.
While the Notre-Dame Cathedral in Paris and Chartres Cathedral are also prime examples of Gothic architecture, with Notre-Dame starting construction in 1163 CE and Chartres demonstrating the evolution of the Gothic style with its rebuilding after a fire in 1194, they followed the earlier innovation established by Saint-Denis Basilica.