The benzodiazepine among the following with the longest half-life is:

A. Oxazepam (Serax): Oxazepam is a short- to intermediate-acting benzodiazepine with a half-life of approximately 6–12 hours. It is metabolized via conjugation and is less likely to accumulate, making it suitable for older adults or those with hepatic impairment. B. Diazepam (Valium): Diazepam is a long-acting benzodiazepine with a half-life of 20–50 hours, and its active metabolites, including desmethyldiazepam, prolong its effect further. Its prolonged duration makes it useful for anxiety, muscle spasms, and seizure prophylaxis but increases the risk of accumulation. C. Lorazepam (Ativan): Lorazepam is an intermediate-acting benzodiazepine with a half-life of approximately 10–20 hours. It is metabolized via conjugation and does not produce active metabolites, limiting prolonged effects. D. Clonazepam (Klonopin): Clonazepam is a long-acting benzodiazepine with a half-life of 18–50 hours. While long-acting, diazepam’s half-life and active metabolites exceed those of clonazepam, making diazepam the longest-acting overall.