The Parisian Pantheon is situated in the V Arrondissement, also known as the Latin Quarter. It was built between 1756 and 1789, and it is considered to be a Neoclassical building. Despite this fact, it adopted many Greek and Roman elements, like the columns, the structure, and decorations. It also adopted other styles, like the Gothic for the central nave, and the Bizantine dome.
All right we need to analyze all the options to understand this answer:
a) Monticello is not even in Paris so is incorrect.
b) St. Peters Basilica. It is incorrect because it is located in the Vatican city so it's wrong.
c) The Pantheon is based in greek and roman architecture more greek than roman. And it was built during the neo-classist movement and era, so it is the correct answer.
d) the Versailles palace could be right because it has a great amount of roman architecture however it doesn't belong to the Neoclassist era. So, it is incorrect.