(D) The hormone $2,4-D$ ($2,4$-dichlorophenoxyacetic acid) is a synthetic auxin.$GA_3$ and $GA_2$ are naturally occurring gibberellins.$IAA$ (Indole$-

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(D) The hormone $2,4-D$ ($2,4$-dichlorophenoxyacetic acid) is a synthetic auxin.$GA_3$ and $GA_2$ are naturally occurring gibberellins.$IAA$ (Indole$-3-$acetic acid) is the most common naturally occurring auxin in plants.Therefore,$2,4-D$ is classified as a synthetic plant growth regulator.