Final answer:
Philosophies are the most abstract level of knowledge and identify central phenomena, consist of abstract and general concepts, encompass a variety of theoretical frameworks sharing core concepts, and offer a broad understanding for theory development.
Step-by-step explanation:
The question concerns the nature of philosophies and their role in abstract thought and inquiry. In addressing which statement is true about philosophies, we look towards their definition and purpose. Philosophy is indeed concerned with the most quintessential principles and ideas. It does not take assertions and beliefs at face value but subjects them to rigorous scrutiny and analysis.
Given the options in the question, we can say that philosophies are the most abstract level of knowledge and identify the phenomena of central concern (Option A). Philosophies also involve sets of abstract and general concepts and their interrelations (Option B). Furthermore, they can encompass a variety of theories that may differ significantly from one another, yet share core concepts (Option C), and can provide a broad understanding of specific fields, such as nursing, leading towards theory development (Option D).
Therefore, philosophies carry an intrinsic value in forming a comprehensive and critical thought process, which helps humans in evaluating thoughts and in the development of theories. Philosophies are not static; they are constantly evolving as part of a rigorous process of inquiry driven by new experiences and critical thinking.