Step 1: Meaning of Sallekhana.
Sallekhana (also known as Santhara) is a Jain religious practice of embracing voluntary death by gradually reducing food and liquid intake.
Step 2: Purpose of Sallekhana.
The practice is undertaken when a person feels their life is nearing its natural end or when facing incurable disease.
It is seen as a way of purifying the soul by renouncing attachments and desires.
Step 3: Option analysis.
- (A) Sky-clad Jain monks: Refers to Digambara monks, not Sallekhana.
- (B) Ekasana: Refers to eating once a day, not fasting unto death.
- (C) Ritual fasting unto death: Correct definition of Sallekhana.
- (D) Nirvana: Liberation of the soul, different from Sallekhana.
Step 4: Conclusion.
Sallekhana is ritual fasting unto death, a practice of detachment in Jainism.