The correct option is A Skoog and Miller
The term kinetin was coined by Skoog and Miller.
Kinetin (N6-furfurylamino purine) is a derivative of adenine. Skoog and Miller identified and crystallized the cytokinesis promoting active substance and termed it as kinetin.
Charles Darwin and his son Francis Darwin observed that when
unidirectional light shines on the coleoptile, it bends in the direction of the light (phototropism) source.
F. W. Went isolated auxin from the tips of coleoptiles of oat seedlings.
Gibberellin is a plant growth regulator. E.Kurosawa, a Japanese botanist, discovered gibberellin when he was investigating the foolish seedling disease of rice.