$A$ beaker is filled with water at $4\,^{\circ}C$. At one time the temperature is increased by a few degrees above $4\,^{\circ}C$ and at another time it is decreased by a few degrees below $4\,^{\circ}C$. One shall observe that:

  • A
    the level remains constant in each case
  • B
    in the first case water overflows while in the second case its level comes down
  • C
    in the second case water overflows while in the first case its level comes down
  • D
    water overflows in both the cases

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