Which of the Following Statements Correctly Describes the Molecules That

Which of the following statements correctly describes the molecules that elicit an immune response?

A) Antigens are small molecules that must be bound to an immunogen to elicit an immune response.
B) Small segments of an antigen that elicit an immune response are called epitopes.
C) Haptens are proteins that elicit the synthesis of antibodies and are also known as antigens.
D) Immunogens are small segments of antigens that are recognized by the immune system.