Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment ?

1. A. It made possible the isolation and exact identification of auxin.
2. B. It is the basis for quantitative determination of small amounts of growth-promoting substances.
3. C. It supports the hypothesis that IAA is auxin.
4. D. It demonstrated polar movement of auxins.

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