Refer to the Figure

Refer to the figure. In the figure, the madreporite is an external opening of a calcified tube that communicates with the circular canal in the middle of the animal.What substance passes through the madreporite, and in which direction?

A) Salt water passes through the madreporite into the body and into the water vascular system.
B) Blood passes through the madreporite out of the body from the circulatory system.
C) Digestive wastes pass through the madreporite out of the body.
D) Fresh water passes through the madreporite out of the body from the water vascular system.
E) Water passes through the madreporite into the digestive system.