Review Question - QID 213888

A 31-year-old woman presents to her primary care physician with a 2-month history of joint pain. She says that she has been getting increasing joint pain in her hands and feet that has been interfering with her ability to work as a secretary. Furthermore, she has noticed that she has been getting numerous oral ulcers over the same time period even though she never had ulcers before. Her husband is worried because she sometimes appears to be confused and acts erratically during these times. Physical exam reveals edema of the legs bilaterally and a new systolic murmur best heard in the right upper sternal border around the second rib. Which of the following types of hypersensitivity is most likely responsible for this patient's edema?