Final answer:
Of the listed drugs, morphine is MOST likely to result in a fatal overdose due to its potency and high risk of dependence and overdose, which is a major concern in the opioid crisis. So the correct option is D.
Step-by-step explanation:
Out of the drugs listed - LSD, mescaline, marijuana, and morphine - morphine is the one MOST likely to result in a fatal overdose. Morphine is an opioid, which is a class of drugs that includes opium, heroin, fentanyl, oxycodone, Vicodin, methadone, and other prescription pain relievers. These opioids are incredibly potent and have a high potential for overdose, especially when taken in high doses or when combined with other substances. The opioid crisis has been particularly damaging due to the addictive nature of these substances and the ease with which they can lead to overdose and death. While LSD and mescaline can lead to significant psychological effects, they have a much lower risk of causing a fatal overdose. Marijuana also has a low toxicity and risk of overdose, which contributes to the ongoing debate about its legalization and the potential risks and benefits associated with it.