The correct option is A I-Cannabis sativa (Hemp), II-Claviceps purpurea (Ergot), III-Erythroxylum coca (Coca), IV-Papaver somniferum (Poppy)
Claviceps is an ergot fungus that grows on the ears of rye and related cereals and forage plants.
Erythroxylon is the coca plant resembles a blackthron bush.
Nicotiana tabaccum or cultivated tobacco is an annually-grown herbaceous plant.
Papaver somniferum is the opium poppy, the species of plant from which opium and poppy seeds are derived.
Cannabis sativa is an annual herbaceous plant in the Cannabis genus which produces hemp.
Thus, the correct answer is option (C), 'I-Cannabis sativa (hemp), II-Claviceps purpurea (ergot), III-Erythroxylon (cacao).IV-Papaver (poppy)'.