**Core Concept:** Language processing in the brain and the role of Wernicke's area for understanding written language and Broca's area for understanding spoken language.

**Why the Correct Answer is Right:** The correct answer is related to the concept of language processing in the brain and the specific areas involved in understanding written (Wernicke's area) and spoken (Broca's area) language. In this case, the patient is experiencing difficulty in understanding written language, which indicates a problem in Wernicke's area. This area is located in the left posterior superior temporal gyrus and is crucial for understanding written language.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because the patient is having difficulty with written language processing, not auditory information.
B. This option is incorrect because the patient's understanding of auditory information is intact, ruling out a global aphasia.
C. This option is incorrect as the patient's language comprehension is impaired for written language but preserved for spoken language.
D. This option is incorrect because the patient's understanding of auditory information is maintained, making a global aphasia unlikely.

**Why the Correct Answer is Right:** The correct answer (D) reflects the patient's preserved understanding of auditory information, which is crucial in differentiating between various types of aphasia. In this case, the patient is suffering from a specific type of aphasia, specifically Broca's aphasia, which affects the ability to produce speech and understand written language due to damage to Broca's area.

**Clinical Pearl:** Broca's aphasia is a type of aphasia characterized by difficulty in speech production and understanding written language, often resulting from damage to Broca's area in the left frontal lobe. This condition highlights the importance of considering the specific language processing regions in the brain when evaluating patients with language deficits.