The temperature of two bodies measured by a thermometer are `t_1=20^@C pm 0.5^@C ` and `t_2=50^@C pm 0.5^@C` . Calculate the temperature difference and error there in .

Options

A. `30^(@)C+-1^(@)C`
B. `70^(@)C+-0.5^(@)C`
C. `30^(@)C+-0.5^@C`
D. `70^(@)C+-1^(@)C`

Answer

A