Axiology is the study of:

Axiology is a significant branch of philosophy dedicated to the study of value. It explores the nature of values, their classification, and their philosophical foundations, encompassing both ethical and aesthetic considerations.

• Values is the correct answer because axiology directly addresses questions about what is good, right, beautiful, and desirable. It delves into moral values (ethics) and values related to art and beauty (aesthetics).
• Knowledge (A) is the central concern of epistemology, which investigates how we know what we know.
• Reality (B) falls under the domain of metaphysics, which examines the fundamental nature of existence and being.
• Methods (D) refers to systematic approaches or procedures used in various fields of study, but it is not a distinct branch of philosophy like axiology, which focuses on a specific subject matter.