The temperature of two bodies measured by a thermometer are $t_1 = 20\, ^oC + 0.5\, ^oC$ and $t_2 = 50\,^oC + 0.5\, ^oC$. The temperature difference and the error there in is
  • A$30{\,^o}C \pm 1{\,^o}C\,$
  • B$70{\,^o}C \pm 0.5{\,^o}C\,$
  • C$30{\,^o}C \pm 0.5{\,^o}C\,$
  • D$70{\,^o}C \pm 1{\,^o}C\,$
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