Concept:In Q. 4:21, marriage is described as a strong and solemn covenant.Explanation:The verse states that husbands have taken from their wives a firm and strong covenant.The Arabic term used in the verse is “mithāq” (mitha~q), meaning a binding agreement.Among the options, this is rendered as “mirhāq”.Neither khitbah, Nika~h, nor Ijbar appears in Q. 4:21 for this reference.Answer:A. mirhāq