An 82-year-old grandmother presents to the ED with her family who report new onset of speech impairment. According to family members, the patient awoke with this symptom as well as difficulty in understanding questions or following commands. Her past medical history is remarkable for atrial fibrillation, but no other notable conditions. On exam, her speech is verbose but poorly comprehensible and lacks meaning. She is unable to follow simple commands. Which of the following best describes her speech disorder?

a) Broca aphasia
b) Dysphonia with expressive deficit
c) Wernicke aphasia
d) Dysarthria
e) Global aphasia