(A) $F.W. Went$ discovered the $Avena$ curvature test in $1928$. This bioassay is used to measure the concentration of auxins, specifically $Indole-3-

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(A) $F.W. Went$ discovered the $Avena$ curvature test in $1928$. This bioassay is used to measure the concentration of auxins, specifically $Indole-3-acetic$ $\text{acid}$ $(IAA)$, based on the curvature produced in oat $(Avena$ $\text{sativa})$ coleoptile segments. Therefore, the correct option is $A$.