$A$ green plant bends towards the source of light when exposed to light on only one side. Which of the following is the best explanation for this phenomenon?

  • A
    The apices of their stems are attracted by light.
  • B
    They need light for photosynthesis.
  • C
    Some auxins accumulate on the shaded side to induce greater cell elongation on that side.
  • D
    Light stimulates the cells on the illuminated side to increase in length.

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