Concept:The Five Pillars of Islam are the five basic acts of worship, and Salat (prayer) is the second pillar.Explanation:The pillars of Islam in order are:1. Shahadah (faith)2. Salat (prayer)3. Zakat (charity)4. Sawm (fasting)5. Hajj (pilgrimage)Therefore, the second pillar is Salat.Answer:B. Salat