Individuals who have consumed alcohol within 24 hours of exposure to hydrogen sulfide can tolerate __________.

Correct Answer: Option B — smaller than normal concentrations of hydrogen sulfide

Alcohol consumption impairs the body's physiological response to toxic gases. Hydrogen sulfide acts as a potent respiratory depressant; ethanol ingestion reduces the body's threshold for toxicity, making individuals significantly more susceptible to the effects of H2S at concentrations that would otherwise be considered manageable for a sober person.