Given below is the diagrammatic sketch of a certain type of connective tissue. Identify the parts labelled A, B, C and D:

- AA: Macrophage, B: Fibroblast, C: Collagen fibres, D: Mast cell
- BA: Mast cell, B: Macrophage, C: Fibroblast, D: Collagen fibres
- CA: Macrophage, B: Collagen fibres, C: Fibroblast, D: Mast cell
- DA: Fibroblast, B: Mast cell, C: Collagen fibres, D: Macrophage