A 14-Year-Old Girl Is Brought to the Physician Because of a 1-Week

A 14-year-old girl is brought to the physician because of a 1-week history of malaise and chest pain. Three weeks ago, she had a sore throat that resolved without treatment. Her parents say that she is also making unintentional rapid and irregular movements of his hands. Her temperature is 38.7°C (101.7°F) . Physical examination shows several firm, painless nodules under the skin near his elbows and the dorsal aspect of both wrists. A new-onset early systolic murmur is heard at the apex in the left lateral position. Which of the following is the most likely mechanism for this patient's condition?

A) Nonspecific T cell receptor activation
B) Cross-reactivity of antibodies against bacterial and host antigens
C) Embolization of an infected thrombus
D) Injury from immune complex deposition
E) Release of an erythrogenic toxin