The daily input of sunlight per square meter per day on the Earth is approximately:

  • A
    $100 \, \text{gm cal}$
  • B
    $400 \, \text{gm cal}$
  • C
    $4,000 \, \text{kcal}$
  • D
    $40,000 \, \text{kcal}$

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