Which of the following relates to the principles of unity?

Oneness of purpose is directly connected to the principles of unity, as it emphasizes the importance of having a central theme or goal that all elements in a design or composition adhere to. This principle ensures that various components work together harmoniously, creating a cohesive visual or conceptual experience. When different elements align toward a common purpose, it strengthens the overall impact and clarity of the work. The focus on unity facilitates better organization and enhances the aesthetic appeal, as all parts seem to relate and contribute to the same message or feeling.

In contrast, variety of perspectives, individual expression, and personal achievement emphasize different aspects of creative design or personal expression. Variety of perspectives highlights diversity and the inclusion of multiple viewpoints, which can sometimes lead to a lack of coherence if not managed well. Individual expression focuses on personal style and uniqueness, while personal achievement concentrates on individual accomplishments rather than collective goals. None of these elements directly embodies the essence of unity as clearly as oneness of purpose does.