-Which Statement Is Supported by This Figure

Multiple Choice

-Which statement is supported by this figure?

A) The greater the concentration of auxin, the more promotion of root elongation occurs.
B) Auxin concentrations below 10−8 g/L promote both root and stem elongation.
C) Auxin concentrations around 10−4 g/L promote stem elongation but inhibit root elongation.
D) Auxin concentrations above 0.9 g/L are best for promoting stem elongation.