In most simple type of canal system of porifera, water flows through which one of the following ways?
Choose Your Option
A. Ostia → Spongocoel → Osculum → Exterior
B. Spongocoel → Ostia → Osculum → Exterior
C. Osculum → Spongocoel → Ostia → Exterior
D. Osculum → Ostia → Spongocoel → Exterior