Determine whether each cell is in the myeloid cell line or the lymphoid cell line.

Attached is an image showing the lymphoid and myeloid cell lines.

From a multipotential hematopoietic stem cell, the myeloid stem cell and a lymphoid stem cell will arise. 

The lymphoid stem cell will give rise to the lymphoblast and will give rise to either a natural killer cell (NK cell) or a lymphocyte. A lymphocyte will now go to either the thymus to produce T-lymphocytes or stay in the bone marrow to produce B-lymphocytes. B-lymphocytes may further differentiate to plasma cells (specialized antibody secreting cells). 

The myeloid stem cell will give rise to other blood components and these include; (1) the megakaryoblast that will further differentiate to megakaryocyte and fragment into platelets; (2) the proerythroblast that will mature to a reticulocyte and then to mature red blood cells; (3) the myeloblast that will either differentiate into neutrophils, basophils, and eosinophils; and (4) monoblast that will mature to monocyte and will be activated in the presence of infection to a macrophage.