Concept:Tahajjud is a voluntary night prayer offered after the obligatory night prayer.Explanation:Tahajjud is prayed after the Isha’ prayer and before the Fajr prayer.It is not compulsory, but it is highly recommended for Muslims.Among voluntary prayers, Tahajjud is considered one of the best.Therefore, the correct time interval is between Isha’ and Fajr.Answer:C. Isha’ and Fajr