Correct Answer:
C. Hazrat Ali (RA)
The correct answer is Hazrat Ali (RA). Abu Turab, meaning 'Father of Dust', was a title affectionately given to Hazrat Ali (RA) by Prophet Muhammad (SAW) himself. This occurred when the Prophet found Ali (RA) sleeping in the mosque, covered in dust. It is a title of great honor and endearment, signifying his humility and closeness to the Prophet.
Hazrat Abu Bakr (RA) was known as As-Siddiq (The Truthful).
Hazrat Umar (RA) was known as Al-Farooq (The Discerner).
Hazrat Usman (RA) was known as Dhun-Nurayn (Possessor of Two Lights).
These titles distinguish them from Hazrat Ali (RA).