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Which of the following best expresses the main idea of the passage?
  • AMarine sediments have allowed scientists to amass evidence tending to confirm that astronomical cycles drive the Earth`s glacial cycles.
  • Bthe ratio between two different isotopes of oxygen in seawater correlates closely with the size of the Earth`s ice sheets
  • CSurprisingly, single-cell marine organisms provide a record of the Earth`s ice ages.
  • DThe Earth`s astronomical cycles have recently been revealed to have an unexpectedly large impact on the Earth`s climate.
  • EThe earth has experienced eight periods of intense glaciation in the past million years, primarily as a result of substantial changes in its orbit.

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