Oxygen-18 has been frequently used in Palaeoclimatology to measure / estimate climate changes in the history of Earth. Consider the following statements in this context: 

  1. It helps in measuring the average atmospheric temperature
  2. Water molecules containing the heavier O-18 evaporate at a higher temperature
  3. When temperature increases the Ratio of O-18 to O-16 will be higher

Which among the above statements are correct ?

[A] 1 and 2 only
[B] 1 and 3 only
[C] 2 & 3 only
[D] all 1, 2, 3

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