The temperatures of two bodies measured by a thermometer are $t_{1} = 20^{\circ}C \pm 0.5^{\circ}C$ and $t_{2} = 50^{\circ}C \pm 0.5^{\circ}C$. Calculate the temperature difference and the error therein.
- A$70^{\circ}C \pm 1^{\circ}C$
- B$30^{\circ}C \pm 0^{\circ}C$
- C$30^{\circ}C \pm 0.5^{\circ}C$
- D$30^{\circ}C \pm 1^{\circ}C$
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