For a section with two levels of headings, which formatting is correct in APA style?

In APA style, the correct formatting for headings involves the use of different levels, each with specific formatting guidelines. For a section with two levels of headings, the first level heading is typically centered and boldface, while the second level heading is flush left and also boldface.

In this context, both centered, boldface text and flush left, boldfaced text conform to APA's requirements for headings at different levels. The first level heading, which would represent the main section, should be centered and bold, effectively standing out within the document. The second level heading, used for subsections within the main section, should be aligned to the left and also bold, creating a clear hierarchy in the organization of the content.

Therefore, the choice that includes both formatting styles for different levels of headings in accordance with APA style is the correct answer. This reflects an understanding of how to effectively structure and present information within a research paper, ensuring clarity and consistency for the reader.