You are answering a USMLE-style medical question. Question: A 7-month-old male infant is brought to the pediatrician by his mother. She reports that the child develops severe sunburns every time the infant is exposed to sunlight. She has applied copious amounts of sunscreen to the infant but this has not helped the problem. On examination, there are multiple areas of reddened skin primarily in sun exposed areas. The child’s corneas appear irritated and erythematous. Which of the following processes is likely impaired in this patient? Options: A) Nucleotide excision repair B) Non-homologous end joining C) Homologous recombination D) Mismatch repair Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.