Mediastinal mass

Q) A 25-year-old man presents to the emergency center with complaints of vague chest  discomfort.  patient is noted to have a large anterior mediastinal mass. The alpha.-fetoprotein levels are markedly elevated. What is the likely diagnosis? ( Theme of next mock test ) 
A. Non seminomatous germ cell tumor
B. Seminoma
C. Thymoma
D. Lymphoma