Concept:The term “Quru’” refers to a rule connected with a woman’s waiting period in Islamic law.Explanation:In Islamic jurisprudence, “Quru’” means menstrual periods or cleanliness between periods.It is used to determine the waiting period called “Iddah.”A woman observes Iddah after the death of her husband or after divorce.The duration of Iddah is counted through Quru’.Therefore, Quru’ is directly related to Iddah.Answer:D. Iddah