A bone marrow biopsy of an 8-year-old girl shows a group of cells which has undergone the process of pyknosis and loss of the nucleus during its differentiation. Which of the following types of hemopoiesis is characterised by the morphological changes described above?

• A. Lymphocytopoesis
• B. Erytropoesis
• C. Monocytopoesis
• D. Granulocytopoesis
• E. Thrombocytopoesis