(B) Abscisic acid $(ABA)$ is a plant growth regulator that acts as a potent inhibitor of seed germination. It promotes seed dormancy and helps the see

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(B) Abscisic acid $(ABA)$ is a plant growth regulator that acts as a potent inhibitor of seed germination. It promotes seed dormancy and helps the seed withstand desiccation and other unfavorable growth factors. Therefore,it is considered the most common natural inhibitor for seed germination.