A 24-year-old man was admitted to the hospital because of abdominal discomfort and shortness of breath. The man was diagnosed with testicular cancer 16 month earlier, for which he underwent a radical inguinal orchiectomy. An abdominal computed tomography revealed a 10-cm mass, and a chest radiograph showed multiple nodules in the lung. The first course of a three-drug combination chemotherapy was started. Which of the following drugs was most likely included in the patient’s combination chemotherapy?