Question: What does this documentary mainly introduce?
(A) Introducing BRABUS's modification of BMW cars. This video records the process of BRABUS's modification of Mercedes Benz E Class
(B) Introducing BRABUS's modification of Audi cars. This video records the process of BRABUS's modification of Mercedes Benz G Class
(C) Introducing BRABUS's modification of Mercedes-Benz cars. This video records the process of BRABUS's modification of Mercedes Benz E Class
(D) Introducing BRABUS's modification of Mercedes-Benz cars. This video records the process of BRABUS's modification of Mercedes Benz G Class
Answer: D