Adding to this comment:
B is just a pie chart (I think that's actually just a product of graphics::pie()in this composite image). C is a bar plot (also from graphics: graphics::barplot()).
Not quite sure how the authors composited everything together. They might have used cowplot or patchwork, but I have a feeling this particular multi-panel figure was probably thrown together in Microsoft PowerPoint (or LibreOffice Impress, if they were open source enthusiasts).