An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true?

  • A
    Bubble rises upwards because pressure at the bottom is less than that at the top.
  • B
    Bubble rises upwards because pressure at the bottom is greater than that at the top.
  • C
    As the bubble rises,its size increases.
  • D
    Both $(b)$ and $(c)$.

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