A traveler to a foreign country develops acute lymphatic filariasis four months after his return to the United States. His symptoms include scrotal inflammation, itching, and localized scrotal swelling and tenderness of the inguinal lymph nodes. Which of the following immune mechanisms does the body employ against the live filarial worms? A. Antibody-dependent cell-mediated cytotoxicity B. Anti-receptor antibodies C. Arthus reaction D. Complement-mediated reactions E. Deposition of circulating antigen-antibody complexes