Which of the following changes would be likely to make terrestrial life on this planet impossible?

  • A
    $A$ decrease in mean temperature by $10^{\circ}C$
  • B
    Change in atmosphere permitting all the solar radiation reaching the upper atmosphere to penetrate to the surface of the earth
  • C
    Change in the orbit of the earth from an ellipse to a circle
  • D
    Disappearance of the moon

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