Which of the following statements is supported by this figure? 
A) Auxin concentrations above 0.9 g/L are best for promoting stem elongation.
B) Auxin concentrations around 10- 4 g/L promote stem elongation but inhibit root elongation.
C) The greater the concentration of auxin,the more promotion of root elongation occurs.
D) Auxin concentrations below 10- 8 g/L promote both root and stem elongation.
Correct Answer:
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