Which one is correct?

Explanation

The correct answer is Option B: The patient passed away during surgery. This phrase is widely accepted in medical and informal contexts to indicate that a patient has died, providing clarity and sensitivity. Option A (The patient passed on during surgery.) is a euphemism that may not be universally understood as death, making it less suitable for this context. Option C (The patient passed off during surgery.) is incorrect as it implies a different meaning entirely-usually related to dismissing or transferring something, rather than meaning to die. Option D (The patient passed by during surgery.) is also incorrect, as it suggests physical movement past something, which is not applicable in this scenario. Therefore, Option B is the most appropriate and clear choice.