Which of the following abbreviations are specifically used only in parentheses?

The choice that indicates abbreviations specifically used only in parentheses is indeed accurate. In APA style, certain abbreviations like 'i.e.' (that is), 'cf.' (compare), and 'viz.' (namely) are typically used within parentheses to clarify or elaborate on a point. These abbreviations help provide additional information without disrupting the flow of the primary text.

While 'i.e.' is often utilized in both the main text and within parentheses, 'cf.' and 'viz.' are more commonly found in parentheses. The purpose of including them in parentheses is to maintain clarity and coherence in the primary argument or discussion while giving the reader supplementary information.

Other combinations like 'vs.' (versus), 'kg' (kilograms), and 'etc.' (et cetera) are not limited to parenthetical use and can appear multiple places in the text, making them inconsistent with the requirement specified in this question. Therefore, understanding the specific contexts in which these abbreviations are used reinforces knowledge of proper APA formatting and sentence construction.