A 45-year-old male is brought to the emergency room by his son because he thinks his father is having a stroke. The patient's face is droopy on the left side, and is unable to smile on his left side of the face. The patient is unable to speak, but is able to answer questions by blinking his eyes, once for yes, twice for no. When was asked if he knew where he was, he blinked once. When asked if he can write down the medications he is currently taking, he blinked twice. Which of the following areas in his brain has been affected that would explain his nonfluent aphasia?