When all points on an outline use the same grammatical structure, the outline is adhering to which of the following principles?

When all points on an outline use the same grammatical structure, it demonstrates the principle of parallelism. This principle is important as it helps create a sense of rhythm and balance in the outline, making it easier for both the speaker and the audience to follow the organization of ideas. By ensuring that each point aligns with the others in terms of grammatical structure, the speaker enhances clarity and coherence, allowing the audience to grasp the relationships between ideas more effectively. This uniformity also contributes to a more professional and polished presentation.

The principle of division refers to breaking down main points into subpoints, while subordination involves organizing ideas in a hierarchical structure, where main points and subpoints are clearly categorized. The principle of structure generally pertains to the overall organization of an outline rather than the specific grammatical format of its points. Thus, parallelism specifically addresses the uniformity in wording, making it the correct choice in this context.