Which row shows the fixed points on the Celsius scale?
- Alower fixed point: boiling point of mercury; upper fixed point: melting point of pure ice
- Blower fixed point: boiling point of pure water; upper fixed point: melting point of pure ice
- Clower fixed point: melting point of mercury; upper fixed point: boiling point of pure water
- Dlower fixed point: melting point of pure ice; upper fixed point: boiling point of pure water