The diagrams illustrate the wage rates paid to cleaners (OWc) and nurses (OWn). What happens if a national minimum wage of $OM$ is brought in?
- Awage rates of cleaners fall; wage rates of nurses rise
- Bwage rates of cleaners no change; wage rates of nurses fall
- Cwage rates of cleaners rise; wage rates of nurses fall
- Dwage rates of cleaners rise; wage rates of nurses no change