The mercury-in-glass thermometer illustrated uses a linear scale. When the temperature is $100^\circ\text{C}$, $h$ is $28\,\text{cm}$. When the temperature is $80^\circ\text{C}$, $h$ is $24\,\text{cm}$. What is the value of $h$ at a temperature of $0^\circ\text{C}$?
- A$0.0\,\text{cm}$
- B$2.8\,\text{cm}$
- C$4.0\,\text{cm}$
- D$8.0\,\text{cm}$