Final answer:
The nurse should anticipate administering Flumazenil to a client who has taken large amounts of diazepam. Flumazenil is a benzodiazepine receptor antagonist that can reverse the sedative effects of diazepam.
Step-by-step explanation:
The nurse should anticipate administering Flumazenil in this scenario. Flumazenil is a medication classified as a benzodiazepine receptor antagonist, meaning it can reverse the sedative effects of benzodiazepines like diazepam.
Options A, C, and D are not appropriate for this situation. Naloxone (option A) is used as an antidote for opioid overdose, not benzodiazepine overdose. Atropine (option C) is an anticholinergic medication used for several purposes, including slowing the heart rate. Vitamin K (option D) is used to treat bleeding problems caused by low levels of clotting factors.
Therefore, the correct answer is B, Flumazenil.