"Pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb," a phrase from Revelations, is depicted in which of the following?

A. Adoration of the Shepherds from the Portinari Altarpiece
B. Altar of the lamb from the Ghent Altarpiece
C. Last Supper from the Holy Sacrament Altarpiece
D. Deposition, triptych from Notre-Dame

Answer: B