Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) Although there are five major parties in Japan, for practical purposes the country is a two-party-dominant system.
B) All of Japan's major political parties were formed in the 1950s.
C) The Social Democratic Party dominated the Diet throughout most of the post World War II period.
D) Most of Japan's political parties are highly factionalized with the divisions primarily involving ideological and policy differences.
E) All of the above.