Concept:The Farewell Pilgrimage (hijjat'l - widā) ended with a sermon giving core moral and social teachings, especially concerning human relations.
Explanation:During the farewell sermon, the Prophet (SAW) strongly emphasised the rights and kind treatment of women.
He commanded Muslims to treat their wives well, acknowledging their rights and dignity.
He also instructed fair and humane treatment of domestic servants and slaves, saying they should be fed and clothed as one feeds and clothes oneself.
The theme focuses on compassion in private and household relationships, not primarily on ritual obligations like zakāh or fasting, nor on judicial procedures.
Therefore, the central lesson of hijjat'l - widā that matches the options is kindness towards women and servants.
Answer:C. treat women and domestic servants kindly