Answer:
Periodic table
Explanation:
Attached is a Public Domain version of the Periodic Table.
The kidneys make two main hormones, vitamin D and erythropoietin. Vitamin D is essential for a number of different functions in the body. Most of the vitamin D that is in the blood is inactive and it is modified by the kidney and other tissues to activate it.
Hey there!
I do believe that your answer will be choice A