A nurse is assessing a client Who is 2 weeks postoperative following a kidney transplant. Which of the following manifestations should the nurse identify as possible organ rejection?

A. Insomnia is not a typical indicator of organ rejection and may be related to stress or medications. B. Temperature of 36.1°C (97.0°F) is within normal range and does not indicate rejection. C. Weight loss is not a common sign of acute rejection; weight gain from fluid retention is more likely. D. Oliguria (decreased urine output) is a key manifestation of kidney transplant rejection, as it may indicate impaired graft function.