The bar chart illustrates the average thickness of the walls of the main chambers in a mammalian heart. Which row correctly identifies the heart chambers?
- Aright atrium: R; left atrium: Q; right ventricle: S; left ventricle: P
- Bright atrium: Q; left atrium: S; right ventricle: R; left ventricle: P
- Cright atrium: R; left atrium: Q; right ventricle: P; left ventricle: S
- Dright atrium: Q; left atrium: R; right ventricle: S; left ventricle: P