Final answer:
The incorrect statement is that erythropoietin is produced by the pancreas to increase the number of CFUs; erythropoietin is actually produced by the kidneys and stimulates red blood cell production. option c.
Step-by-step explanation:
The statement that is incorrect is: Erythropoietin produced by the pancreas increases the number of CFUs. Erythropoietin (EPO) is actually produced by the kidneys, not the pancreas. EPO stimulates the production of erythrocytes (red blood cells) within the bone marrow.
Thrombopoietin, which is correctly stated as being produced in the liver (and also the kidneys), does indeed stimulate the formation of platelets from megakaryocytes. Colony-stimulating factors (CSFs) and interleukins are also correctly identified as stimulators for the proliferation and differentiation of formed elements in the blood, but they are not primarily associated with erythrocyte formation as stated in the question.