The initial idea to preserve the Glorious Qur'ān was mooted by
Zaid b. Thābit
'Umar b.Khattāb
'Uthmān b. 'Affān
'Abū Bakr As-Saddiq
Correct answer is B
Umar ibn al-Khattab (r. 634-644 CE) was the second caliph of the Rashidun Caliphate (632-661 CE, as the first four caliphs are referred to by the Sunni Muslims). He was an early convert of Islam and one of the close companions of the Islamic Prophet Muhammad.
He was the one who brought the initial idea of preserving the glorious Qu'ran.