Final answer:
The term in harmony that defines the modern harmony that avoids any sense of a home key center is atonal.
Step-by-step explanation:
The correct answer is d) Atonal. Tonic, dominant, and subdominant are basic terms in harmony that are commonly associated with a home key center. A home key center refers to a tonal center or a sense of tonality, in which a specific key is established. However, atonal music does not revolve around a specific key or tonal center. Instead, atonal music avoids any sense of a home key center and often uses dissonant or unresolved harmonies.