A thermometer may be read with an accuracy of $\pm 0.5^{\circ}\text{C}$. It is used to measure a temperature increase from $40^{\circ}\text{C}$ to $100^{\circ}\text{C}$. What is the percentage uncertainty in the measurement of the temperature increase?
- A$0.5\%$
- B$0.8\%$
- C$1.3\%$
- D$1.7\%$