Concept:The Islamic declaration of faith (Shahadah) centres on belief in Allah and His messenger.Explanation:The Shahadah affirms that there is no god but Allah and that Muhammad (SAW) is His messenger.It also expresses submission to Allah’s will and is practised through the five pillars of Islam.The obligation to wage Jihad is not a central tenet of the declaration of faith.Answer:D. Obligation to wage Jihad