(B) Auxins are a class of plant hormones that promote growth. Indole$-3-$acetic acid $(IAA)$ is the most common and well-known naturally occurring aux

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(B) Auxins are a class of plant hormones that promote growth. Indole$-3-$acetic acid $(IAA)$ is the most common and well-known naturally occurring auxin in plants. $2, 4-D$ $(2, 4-\text{dichlorophenoxyacetic acid})$ and $NAA$ $(Naphthalene acetic acid)$ are synthetic auxins. Maleic hydrazide is a plant growth inhibitor.