Final answer:
In hypovolemic shock, a urinary output of less than 20 mL/hour indicates inadequate renal perfusion, with the normal minimum urine volume necessary for bodily functions being about 500 mL/day. Option d) 20 mL/hour is therefore the correct answer.
Step-by-step explanation:
In hypovolemic shock, renal perfusion and urinary output decline significantly. Monitoring urinary output is crucial for assessing the extent of renal perfusion. A urine output of less than 30 mL/hour is generally indicative of inadequate renal perfusion, and in the context of acute renal conditions such as hypovolemic shock, pertains to a serious concern for oliguria. The kidneys normally produce a minimum urine volume of about 500 mL/day to rid the body of wastes. Any output below this level might suggest renal impairment and would warrant immediate medical attention. Therefore, of the options provided (a) 40—20 mL/hour, b) 60—40 mL/hour, c) 80—60 mL/hour, and d) 20 mL/hour), option d) 20 mL/hour is considered as the threshold below which renal perfusion is deemed inadequate.