What is a defining feature of the Ionic Column?

The defining feature of the Ionic column is the volutes on its capital. The volutes are the distinctive scroll-like ornaments that are found on either side of the column's top. This characteristic sets the Ionic column apart from other types of columns, such as the Doric and Corinthian styles, which have different capital designs.

The Ionic column is known for its slender, more graceful proportions as well as its decorative elements, which reflect the intricacy and elegance of ancient Greek architecture. It originates from the Ionia region on the coast of Asia Minor and is often associated with temples and buildings that embody a sense of sophistication and beauty, showcasing the artistry of classical architecture.

The other choices, while they may describe different architectural elements or styles, do not capture the unique identification of the Ionic column as effectively as the presence of volutes.