Final answer:
San Carlo alle Quattro Fontane is an iconic example of Baroque architecture due to its complex geometrical plan, dynamic façade, and sculptural details created by Francesco Borromini. The correct option is C.
Step-by-step explanation:
The church of San Carlo alle Quattro Fontane in Rome, Italy, is a quintessential example of Baroque architecture. This architectural style is known for its dynamism, sense of movement, and ornamental richness.
The church, designed by Francesco Borromini, showcases the Baroque penchant for complexity and theatricality through its use of a convex-concave façade, a complicated plan that is partly oval and partly a cross, and its dynamic interplay of shadows and light. Moreover, the sculpted quality of the façade, with intricate details and dramatic curves, draw the eye and enhance the structural dynamism, making this church an iconic Baroque structure.