It is an ideal case of the Neoclassical style. Neoclassical design is a structural style delivered by the neoclassical development that started in the mid-eighteenth century. In its purest shape, it is a style chiefly got from the engineering of traditional artifact, the Vitruvian standards, and crafted by the Italian modeler Andrea Palladio.
I would say b. but i am probably wrong so I wouldn't rely on my response
