You are answering a USMLE-style medical question. Question: A 40-year-old man comes to the physician for the evaluation of a painless right-sided scrotal swelling. The patient reports that he first noticed the swelling several weeks ago, but it is not always present. He has hypertension treated with enalapril. His father was diagnosed with a seminoma at the age of 25 years. The patient has smoked a pack of cigarettes daily for the past 20 years. Vital signs are within normal limits. Physical examination shows a 10-cm, soft, cystic, nontender right scrotal mass that transilluminates. The mass does not increase in size on coughing and it is possible to palpate normal tissue above the mass. There are no bowel sounds in the mass, and it does not reduce when the patient is in a supine position. Examination of the testis shows no abnormalities. Which of the following is the most likely cause of the mass? Options: A) Patent processus vaginalis B) Dilation of the pampiniform plexus C) Twisting of the spermatic cord D) Imbalance of fluid secretion and resorption by the tunica vaginalis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.