To solve this matching problem, we need to identify which plant or application each substance in List I is correctly associated with in List II.

List I (Substances) and List II (their sources or uses):

• Cocaine - Cocaine is derived from the coca plant, known scientifically as Erythroxylum. This matches with III in List II.
• Heroin - Heroin is derived from the opium poppy, Papaver somniferum. This corresponds to IV in List II.
• Morphine - Like heroin, Morphine is also derived from the opium poppy, Papaver somniferum. However, morphine is also directly associated with its use as a sedative in surgery, making I a valid association for its usage.
• Marijuana - Marijuana is derived from Cannabis sativa, which corresponds to II in List II.

With this information:

• A (Cocaine) matches with III (from Erythroxylum).
• B (Heroin) matches with IV (Papaver somniferum).
• C (Morphine) as an effective sedative in surgery matches with I.
• D (Marijuana) matches with II (Cannabis sativa).

The correct matching based on the provided options is:

Option D: A-III, B-IV, C-I, D-II

This option correctly matches the substance with their respective sources or primary uses.