A student wants to calibrate a mercury-in-glass thermometer on a $^\circ\text{C}$ scale. Which values should she choose for the lower fixed point and for the upper fixed point?
- Alower: melting point of ice; upper: boiling point of mercury
- Blower: melting point of ice; upper: boiling point of water
- Clower: melting point of mercury; upper: boiling point of mercury
- Dlower: melting point of mercury; upper: boiling point of water