The graph illustrates the pressure changes occurring in the right atrium, right ventricle and left ventricle of a human heart as the muscle walls contract and relax. What is the pressure in the right ventricle when the left ventricle reaches its highest pressure?
- A$0.4\,\text{kPa}$
- B$2.0\,\text{kPa}$
- C$3.0\,\text{kPa}$
- D$15.0\,\text{kPa}$