The best place to view the primary pathological process in action is generally on the edge of the lesion- in the middle it will often be confused by secondary changes, such as necrosis and haemorrhage. Normal lung to left of image. On right note infiltration of alveolar spaces by cells.   Note different sizes and shapes of cells (pleiomorphism), some binucleated cells, some joined and others not (degrees of de-differentiation) Name the labels for the section below: A: Alveolar wall , B: Cells forming a line , C: Cells within alveolar spaces .