The diagram shows the stem of a Celsius thermometer, with markings indicating the initial and final temperature readings. What is the temperature change, written to an appropriate number of significant figures?
- A$14\,^{\circ}\text{C}$
- B$20.5\,^{\circ}\text{C}$
- C$21\,^{\circ}\text{C}$
- D$22.0\,^{\circ}\text{C}$