A nurse is assisting with the care of a preschooler who is postoperative following tetralogy of Fallot correction. Which of the following manifestations indicates the child is possibly experiencing decreased cardiac output?

A. Capillary refill of 2 seconds is normal and does not indicate decreased cardiac output. B. Warm extremities are a positive sign, indicating good perfusion. C. Diminished pulses can indicate decreased cardiac output, suggesting inadequate perfusion to the extremities. D. The blood pressure reading provided is within normal limits for a preschool-aged child and does not indicate decreased cardiac output.