A 3- year-old female child whose growth rate has been in the lower 10th percentile over the last year presents with chronic, nonproductive cough and diarrhea with foul-smelling stools. She is diagnosed as having cystic fibrosis. For which of the following vitamins is this child most likely to be at risk of deficiency?

a) Vitamin C

b) Vitamin B6

c) Folic acid

d) Retinol (vitamin A)

e) Riboflavin (vitamin B2)

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