Concept:Adh-Dhikr means "the Reminder" or "the Remembrance."Explanation:The Qur'an refers to itself as Adh-Dhikr because it is a reminder for all mankind.It continually calls people back to the worship of Allah and to a life of righteousness.Therefore, the quality that directly matches the name Adh-Dhikr is that it reminds one to be righteous at all times.The other names describe different roles of the Qur'an: Al-Furqan distinguishes truth from falsehood, while Ash-Shifa represents healing.Answer:C. reminds one to be righteous at all times.