The table shows three kinds of water. Which statement is correct?
- AOnly Q and R are suitable for drinking, while P could be used for irrigation.
- BOnly Q and R are suitable for drinking, while P is unsuitable for any purpose.
- COnly Q is suitable for drinking. R could be used for washing cars and P for irrigation.
- DP, Q and R are suitable for irrigation and washing cars, but are not suitable for drinking.