A a history textbook on the events of World War II
B a book about the effects of World War II
are your answers
C and D are primary sources, because they have information that came from a person who lived during the events that occurred. This rules A out, for textbooks are generally written years after the event. A book about the effects of World War II is also ruled out, because the event must end first before you can write about the aftermath.
~ La Pucelle