A 4-year-old boy is brought to the physician because of slow growth during the past year. He has had recurrent urinary tract infections since the age of 1 year. He is at the 10th percentile for height and 25th percentile for weight. Physical examination shows pallor. Laboratory studies show a normochromic, normocytic anemia and increased serum concentrations of urea nitrogen and creatinine. Urinalysis shows a low specific gravity. Which of the following sets of additional serum findings is most likely in this patient?

A) Decreased ferritin, decreased transferrin saturation
B) Increased ferritin, increased transferrin saturation
C) Increased ferritin, decreased transferrin saturation
D) Decreased ferritin, increased transferrin saturation