The presence of ozone $(O_3)$ in the atmosphere of Earth:

  • A
    Hinders higher rate of photosynthesis
  • B
    Helps in checking the penetration of ultraviolet rays to Earth
  • C
    Has been responsible for increasing the average global temperature in recent years
  • D
    Is advantageous since it supplies $O_2$ for people travelling in jets

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The Montreal Protocol refers to:

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