Step 1: Understanding the Concept:
This question asks for the standard, globally recognized definition of "Health."
Defining health broadly helps public health agencies design programs that target mental and social well-being in addition to physical medical treatments.
Step 2: Detailed Explanation:
In its 1948 constitution, the World Health Organization (WHO) formally defined Health as:
"A state of complete physical, mental (emotional), and social well-being and not merely the absence of disease or infirmity."
This definition was a major milestone because:
1. It moved the definition of health away from a purely medical model (which only focused on clinical disease).
2. It recognized that psychological (emotional) stability and social integration are equally vital components of a healthy life.
While physical fitness (A) is a component of physical health, and spiritual peace (C) can contribute to emotional well-being, only "Health" represents the complete, holistic definition formulated by the WHO.
Therefore, the correct answer is Health.
Step 3: Final Answer:
The correct option is (B).