Concept:
According to the World Health Organisation (WHO), health is defined as:
“A state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”
Thus, the definition of health includes:
• Physical well-being
• Mental well-being
• Social well-being
Political stability and conflicts are important social factors affecting health indirectly, but they are not included in the WHO definition of health.
Step 1: Analyze statement A.
Physical well-being is included in the WHO definition of health.
Hence, A is correct.
Step 2: Analyze statement B.
Mental well-being is also included in the WHO definition.
Hence, B is correct.
Step 3: Analyze statement C.
Social well-being forms an essential part of the WHO definition of health.
Hence, C is correct.
Step 4: Analyze statement D.
Political stability and conflicts are not directly included in the definition of health given by WHO.
Hence, D is incorrect.
Step 5: Select the correct option.
The correct combination is:
\[
A, B, C \text{ only}
\]
Therefore, the correct answer is:
\[
\boxed{(C)\ A, B, C\ \text{only}}
\]