Concept: Identifying what is described in the second verse of Surah Ad-Dhuha.Explanation: Surah Ad-Dhuha is named after the morning brightness. Its first verse (Q93:1) points to daylight or sunshine. The second verse (Q93:2) says: "And by the night when it is still." This verse clearly refers to the night and its darkness or calm. It does not describe a thunderstorm, sunshine, or daybreak. The term "nightfall" exactly matches the meaning of this verse.Answer: D. nightfall