(D) The correct answer is $D$. $Indole-3-acetic acid$ $(IAA)$ is the most common and primary natural auxin found in plants. $Maleic$ $acid$ is a dicar

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(D) The correct answer is $D$. $Indole-3-acetic acid$ $(IAA)$ is the most common and primary natural auxin found in plants. $Maleic$ $acid$ is a dicarboxylic acid,$Abscisic$ $acid$ is a plant growth inhibitor,and $Pyruvic$ $acid$ is a key intermediate in cellular respiration.