Plant hormones can have different effects at different ...

[xclash]

Plant hormones can have different effects at different concentrations. This explains how
A) some plants are long-day plants and others are short-day plants.
B) signal transduction pathways in plants are different from those in animals.
C) plant genes recognize pathogen genes.
D) auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axillary buds.
E) gibberellin concentration can both induce and break dormancy.

[clippers!]

I chose D and got the answer, hope that helps.