Final answer:
Wisdom helps understand what is right, just, and fair, but not necessarily what is holy.
Step-by-step explanation:
The subject of this question is Ethics, which falls under the category of Social Studies. The question asks which of the following aspects are not understood by wisdom according to Proverbs 2:9. The correct answer is D. What is holy. Wisdom helps one understand what is right, just, and fair, but it does not necessarily encompass understanding of what is holy.