Final answer:
Platelets are derived from myeloid stem cells, specifically CMP.
Step-by-step explanation:
The correct answer is 2) CMP.
Platelets are derived from myeloid stem cells, which give rise to all the formed elements of blood, including platelets, erythrocytes (red blood cells), and various types of leukocytes (white blood cells).
According to the provided information, platelets are cell fragments that are released into the circulation by megakaryocytes, which are descendants of myeloid stem cells.