Concept:The tenth year of Hijrah pilgrimage is known as Haijul Wada, meaning the Farewell Pilgrimage.
Explanation:This was the only Hajj performed by the Prophet Muhammad (SAW) after the Conquest of Mecca.
It took place in the tenth year of Hijrah.
The name Haijul Wada was given because it was the last Hajj performed by the Prophet (SAW).
During this pilgrimage, he delivered the famous farewell sermon.
Shortly after this Hajj, the Prophet (SAW) passed away.
Therefore, it is called the Farewell Pilgrimage because it was his final Hajj, not merely because of a large congregation or the revelation of the Qur'an.
Answer:C. was the last one performed by the prophet (SAW)