Concept:Khula fa'ul - Rashidun means the rightly guided caliphs who led Islam after the Prophet.
Explanation:They are the four immediate successors of Prophet Muhammad (SAW).
They were pious leaders chosen for their justice, wisdom, and loyalty to Islam.
Their names and order of rule are:
1. Abu Bakr as-Siddiq
2. Umar ibn al-Khattab
3. Uthman ibn Affan
4. Ali ibn Abi Talib
These four caliphs ruled consecutively after the death of the Prophet.
Muslims honour them as the best and most rightly guided generation of leaders.
Therefore, the Khula fa'ul - Rashidun are exactly four in number.
Answer:C. four