Concept:The first official compilation of the Quran into a single book form was ordered by Abū Bakr, the first Khalifah.
Explanation:After the Battle of Yamāmah, many Muslims who had memorised the whole Quran were killed.
Umar b. al-Khaṭṭāb then advised Abū Bakr to preserve the Quran by collecting it into written pages, because the lives of its memorisers were in danger.
Abū Bakr accepted this advice and ordered Zayd b. Thābit to gather all the verses and record them in one muṣḥaf.
This was the first time the Quran was assembled as a single written book during the caliphate of Abū Bakr.
Uthmān b. Affān later used that same compilation to produce standardised copies for the Muslim lands.
Therefore, the Khalifah who ordered the initial compilation in book form was Abū Bakr b. Abū Quḥāfah.
He is better remembered for his role as a trusted companion and as the immediate successor to Prophet Muhammad (SAW).
Answer:C. Abu Bakr b. Abu Quhafah