To solve this problem, we need to match the substances in List I with their corresponding effects or characteristics in List II. Let's analyze each substance:$\newline \bullet$A. Heroin:$\newline$ - Heroin is an opioid drug that is known to slow down body functions.$\newline$ - This matches with II.$\newline \bullet$B. Marijuana:$\newline$ - Marijuana can have various effects, including on the cardiovascular system, such as increasing heart rate.$\newline$ - This matches with I.$\newline \bullet$C. Cocaine:$\newline$ - Cocaine interferes with the transport of dopamine, leading to its stimulating effects.$\newline$ - This matches with IV.$\newline \bullet$D. Morphine:$\newline$ - Morphine is a well-known painkiller used to relieve severe pain.$\newline$ - This matches with III.$\newline$Now, let's match the items from List I with List II:$\newline A \rightarrow II, B \rightarrow I, C \rightarrow IV, D \rightarrow III \newline$This corresponds to Option 1, which is the correct option.