Which of the Following Statements BEST Describes Antigen Presentation

Which of the following statements BEST describes antigen presentation?

A) the process of oxidant production by antigenic proteins
B) the process where antigens adhere to the walls of body cells using adhesion molecules such as integrins
C) the process of continuous proliferation and differentiation of antibodies in response to antigens
D) the process in which the antigen-major histocompatibility complex (MHC) protein compound is inserted into a body cell's plasma membrane
E) the process in which antigenic proteins break down into peptide fragments to bind with major histocompatibility complex (MHC) proteins