To solve this problem, we need to match the substances in List I with their corresponding sources or uses in List II. Let's analyze each item:$\newline \bullet$A. Cocaine:$\newline$Cocaine is an alkaloid obtained from the leaves of the plant Erythroxylum coca.$\newline$This matches with III.$\newline \bullet$B. Heroin:$\newline$Heroin is a semi-synthetic derivative of morphine, which is obtained from the opium poppy,Papaver somniferum.$\newline$This matches with IV.$\newline \bullet$C. Morphine:$\newline$Morphine is a natural opiate extracted from the opium poppy,Papaver somniferum. It is used as an effective sedative and pain reliever in surgery.$\newline$This matches with I.$\newline \bullet$D. Marijuana:$\newline$Marijuana is derived from the plant Cannabis sativa.$\newline$This matches with II.$\newline$Now, let's match the items from List I with List II:$\newline A \rightarrow III, B \rightarrow IV, C \rightarrow I, D \rightarrow II \newline$This corresponds to Option 2.