According to the passage, the book the Chrysanthemum and the Sword describes ______.
A．the life and thought of Japanese in the 1930s and 1940s
B．an American’s visit to Japan during the World War Ⅱ
C．how the World War Ⅱ broke out in 1942
D．Japan’s fighting with the U.S.A. in the 1940s