The correct answer is A. Writing about specialized or technical content.
Explanation:
Technical vocabulary in texts or speeches of a specific academic area such as engineering, architecture, science or psychology. This is because these areas require the use of specific terms that are used by most people; moreover, these require specialized content related to the focus of the specific area. For example, in a medical article, you can find technical terms such as treatment, pharmacokinetic or hydration and these are necessary to understand the content of the article. Thus, technical vocabulary is most often used when "writing about specialized or technical content".
