Concept:Sunnah complements the Qur'an by providing guidance when the Qur'an is silent.Explanation:The Qur'an is the primary source of Islamic law.The Sunnah is the second source of Shari'ah.It explains and clarifies the Qur'an.When the Qur'an has no explicit ruling on a matter, the Sunnah gives the needed direction.Therefore, Sunnah is important for guiding Muslims in situations that the Qur'an does not directly mention.Answer:D. provides guidance where the Qur'an is silent