A) a history textbook on the events of World War II
B) a book about the effects of World War I
The other items listed are all <u>primary</u> sources.
Primary sources are things that come from persons directly involved in the events or lives being studied. So, any diary entries or letters (like the diary of Anne Frank or a letter by a soldier) would count as primary sources. So would any official proclamations or letters or government documents -- such as the Constitution of France.
Secondary sources are written by historians or others after their study of primary sources.
