CRNAs are valuable to hospitals and major medical centers because ______. a) the high cost of CRNAs created a demand for anesthesiologists to work in relatively complex surgical procedures. b) the high cost of anesthesiologists created a demand for CRNAs to work in relatively straightforward surgical procedures. c) the high cost of CRNAs created a demand for anesthesiologists to work in relatively straightforward surgical procedures. d) the high cost of anesthesiologists created a demand for CRNAs to work in relatively complex surgical procedures