Concept:Witr is a supererogatory prayer normally performed with an odd number of rak'ahs, and it may be prayed as a single rak'ah.
Explanation:Witr prayer is offered after the Isha prayer and lasts until before the Fajr prayer.
It is strongly recommended and considered a supererogatory act in Islam.
The word "witr" means "odd," indicating that the prayer should be completed with an odd number of rak'ahs, such as one, three, five, or seven.
A single rak'ah of Witr can be performed alone, especially when following the practice of the Prophet Muhammad (peace be upon him).
Therefore, among the given options, Salatul Witr is the supererogatory prayer that consists of a single rak'ah.
Answer:C. Witr