The correct option is C AMO 1618
Weedicides or herbicides are weed killers or pesticides used to control weeds in agricultural farms. AMO 1618 or (2-isopropyl-5-methyl-4-trimethylammonium chloride)-phenyl-1-piperidine carboxylate is an inhibitor of gibberellin biosynthesis which leads to retarded germination. Higher concentrations will lead to reduced sensitivity of seeds.