A 72-year-old male is evaluated for a 1-year history of bilateral lower extremity edema and abdominal distension. Eight years agohe had esophageal carcinoma treated with radiotherapy. Which of the following conditions is the patient most likely experiencing?
a) Esophageal varices
b) Ascites secondary to liver cirrhosis
c) Lymphedema secondary to radiotherapy
d) Heart failure with right-sided involvement