The given figure shows the nephridial system of earthworm and answer the question .

Select the option which shows the correct identification and the function of the structure marked as “X”.
A. Lateral heart. It is a blood pumping organ
B. Calciferous glands. They neutralize the humic acid present in humus .
C. Nephridia. It regulates the volume and composition of the body fluids.
D. Blood glands. They prouduce which is dissolved in blood plasma.