The artistic talents of Barbara Chase-Riboud, most known for her 1979 historical novel Sally Hemings and the conversation it inspired, ________ limited to the realm of prose: she first excelled in sculpture, where her affinity for bronze--a material she described as "timeless" due to its use across eras and cultures--became part of her artistic identity.

Which choice completes the text so that it conforms to the conventions of Standard English?