You are answering a USMLE-style medical question. Question: A 67-year-old male is seen by neurology after he was noticed to be speaking strangely by his family. After acute treatment with tissue plasminogen activator (tPA), the patient is able to recover most of his speech. Subsequent neurologic exam finds that the patient is fluent while speaking and is able to comprehend both one and two step instructions. Noticeably the patient remains unable to complete tasks involving verbal repetition. Residual damage to which of the following structures is most likely responsible for this patient's syndrome? Options: A) Arcuate fasciculus B) Superior temporal gyrus C) Inferior frontal gyrus + superior temporal gyrus D) Arcuate fasciculus + inferior frontal gyrus + superior temporal gyrus Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.