Bone marrow is responsible for producing:

a : plasma
b : vitamins
c : red and white blood cells
d : blood

Bone marrow is the spongy, fatty tissue inside your bones. It creates the following parts of the blood: red blood cells, which carry oxygen and nutrients throughout the body. white blood cells, which fight infection. platelets, which are responsible for the formation of clots. So, the answer is C: Red and White Blood Cells :)