Concept:During the caliphate of Uthman b. Affan, a committee was formed to standardise the text of the Qur'an into one authentic script and dialect.
Explanation:The committee really included Zayd b. Thabit as chairman, along with Abdallah b. al-Zubayr, Sa'id b. al-As, and Abdur Rahman b. Harith b. Hisham.
These men were chosen because they were reliable memorisers and writers of the Qur'an who also belonged to the Quraysh tribe.
In contrast, Zayd b. Harith was a different companion; he was the freed slave and adopted son of the Prophet, and he had passed away at the battle of Mu'tah long before Uthman's time.
Therefore, he never served on the standardization committee.
Answer:A. Zayd b. Harith.